Help in putting together my system with used equipment on Audiogon and eBay.

Your post reminds me of my re-entry into hifi about twelve years ago, and I'd hope you wouldn't repeat my mistake: since I lived in a backwater, I read everything and then spent tons experimenting and upgrading and downgrading.  If I had it to do all over again, I would have first spent money to travel to a large city with several good hi-end dealers and auditioned speakers.  While it is fact that ultimately what we all do is find a system that suits our listening rooms and tastes, speakers lock in the biggest chunk of what a system can do.  I also would not require expensive speakers: I've been quite happy with Tannoy Revolution XT8 speakers that cost $2400/pr. new, some of the least expensive speakers I've owned.

I would say the next step is choosing solid state vs. tubes.  The best system I ever owned used a tube preamp (Audio Research Reference 3) with a SS power amp (McIntosh MC-150);  speakers were Sonus Faber Cermona Ms.  Tubes give you flexibility in tailoring the sound after your purchase; changing tubes can radically change the sound.
A final remark: while I love vinyl and consider its unique sound irreplaceable, getting into vinyl would be the most expensive single choice you could make.  Far more cost effective to get a CD player for your existing music and then add streaming, assuming your internet connection supports it and you don't mind messing with computer stuff.
Enjoy the journey!

I have more to add, now that I have some time.  The VMPS speakers I mentioned are so good sounding and reviewed by experts that I put my speakers up for sale on Saturday last week, by Sunday had a full price offer and got another FP offer the next day from another.  Upon listening to them for the first time since I bought my idea of the speakers I couldn't afford, but got a very good deal on, I was floored at the new ability they had since going through many cable changes in the 17 months with the dream speakers.  The VMPS speakers are among the few that have amazing detail, great potent bass, and hopping dynamics, with a wide, deep soundstage, and can play at high volume, yet sound great at low volume.  They are also adjustable in levels for the treble, mids and bass.  The bass can be played with to sound anywhere from very tight to much more full and places in-between.  So your room won't be such an issue by using a big, powerful speaker.  The electronic combo I recommended has a great tube preamp, and powerful class D amp that absolutely will do what you want, allow you to hear all that is going on.  You can take a bit of those who know a component or two and what they MAY do for the sound, but this is a very high chance of being way more system than you thought you could buy.

Hey, it's your money.
Bob

Imabucfan......We have been speaking via PM, but, I want to come out in the open about what I mentioned to you. Without listening, you ordered the Pass pre and Bryston amp. You could have done worse. Maybe not even better at those prices, simply different. You have Klipsch Heresy IIIs, and a good subwoofer. You need sources ( cd player / transport / DAC / streamer, etc ). I encouraged you to connect it all, and see ( HEAR ), what it would be like. Basic cabling for now. People still do not give Klipsch a fair deal, but so many renowned reviewers, have really liked the Heresy IIIs, and as you know, I am a Klispch Heritage fan boy ( for 50 years ). They do many things right. You are making yourself crazy at this point, and despite people here trying to help, they really are not. Use the gear you have. Many folks here, when they started, did not have the level of gear you have. Tubes, different amp, different speakers ? At this point, use what you have. Get your front end ( sources ), start listening to what you have, go to the Tampa show, and then, listen, again, to what you have. Find out what kind of listener YOU are, not the listener, everyone else is. The system you currently have, will extract much information from your selected source, as it will give you ( 1 ) the ability to find out what you like and dislike, as in educating your ears ( 2 ) the ability to play around with the room acoustics / listening chair sweet spot, with this system, as this will help you with any, and every, future change you make. I am hoping someone else here agrees with me, because, I am right. You, and everyone, need to slow down. With a good source or two, you have the makings of an excellent 1st system, and, a system in which to learn, about you, as a listener. That is all.