Help me upgrade my beginner system!

These are all great suggestions, however given where you are right now I too, lean towards replacing your speakers. 

You may want to consider Elac Vela Floorstanding 407 or 408. 

https://www.elac.com/category/floorstanding-speakers/vela-fs408/

You would problably get the best investment value as it has a very good frequency response (Larger Sound Stage) for the money.

@dvujovic j Your PeachTree Nova is OK not great. I had the PeachTree NOVA 150 for a few years.

I suggest you take a chance and buy the Peachtree GAN1 and the BluesNode streamer for sub integration, analog input, and MAYBE volume. I am not sure about volume.

Trade in the NOVA 300 for the GAN1.

GaN 1 | Peachtree Audio

Now this will be better than what you currently have. However, if you are willing to lose the warranty. Send in the unit to Ric Shultz at TweakAudio.com and let him do the mods that he did to my unit (I was the Guinea pig for these mods).

Digital amp mods (tweakaudio.com)

This unit is so good now that I sold $7K of gear that became redundant.

In the past, I spent around $30K to drive my RAAL SR1a headphones using 2-channel gear. The modded GAN1 is better than that on my headphones and comparable to the the 2-channel gear on my 2-channel speakers.

Since you already have a NOVA 300 this trade-in and mod is something economical.

BTW - In the PeachTree hierarchy, in a scale of 1-to-10. My old Nova 150 was a 1/10 and the GAN1 is a 10/10.

BTW2 - I use a Lumin X1 DAC as a SPDIF streamer to the GAN1 via fibre optic input to the X1. This is a $15K streamer and likely much better than the Bluesnode streamer. However, the NODE give you sub integration and analog input. Both of which I lack on my X1 streamer.

BTW3 - I think what I am suggesting is similar to Mark Levinson’s new company and product.

Maria Amplifiers – Daniel Hertz SA

I just saw this online.

Peachtree GAN-1 unboxing & video review | Darko.Audio

Have not watched it but the stock unit is not as good as what I have. The difference is rather big.

I also owned a Peachtree Nova 150 a few years ago. Ditching that amp and going to a modestly-priced Parasound A23 was a huge jump in sound quality. If you can afford it, look into Parasound HINT 6 Halo integrated amp. You can also search for used models as they are very popular and show up in the used market often. I am confident you will love the ’upgrade’.

Your speakers are quite good and will scale with better downstream components. If I was in your shoes, my upgrade path would look like this ...

1. Get rid of Peachtree Nova and replace with something like Parasound HINT 6 Halo integrated amp and DAC combo.

2. Replace your subwoofer with REL -- preferably T7x if possible. Again, readily available in the used market. However, after upgrading the amp you might not even feel the need to upgrade the sub.

3. Replace speakers ... this should be the last option. IMO, you should space out the upgrades with at least 4-6 months in between, i.e. get the new amp and live with it for at least 4-6 months, and so on and so forth.

A decent surge protector is different from a power conditioner and yes we all need one.  We just had a power outage that tripped the protectors in all 3 of my systems.

Everything survived, thankfully