Here I am, a year later and many changes to my system. I went the DIY route for, mainly, two reasons: (1) I could gather better quality parts over time and save $$ using my labor to construct, and (2) The opportunity to learn - a little - about electronic components.
First, I constructed a Madisound speaker kit (Zaph|Audio ZRT 2-Way) which uses great Scan-Speak Revelator drivers. As the designer, John Krutke, says: "This is about as good as it gets for a 7" 2-way." These revealed a whole lot more detail, clarity and music than was available with my old speakers.
I then investigated various DIY preamp possibilities and "found" Roy Mottram of tubes4hifi who provided some much needed confidence (re. working on electroncis) and assembly help. I purchased, from Roy, John Broskie's Tetra phono and Aikido line stages and built my tube preamp. I eventually upgraded the tubes from the inexpensive ones I started with to NOS (and good/used) Telefunken and Amperex.
This start into the tube world got me interested in a new amplifier and so I obtained from Roy's partner, Bob Latino, his ST-120 VTA Dynaco-clone kit which I finished a couple of weeks ago.
I AM VERY HAPPY. My system has gone from a nice budget audio system to a superb music machine. It has it all: imaging, soundstage, detail, clarity, etc. I have had a great voyage of discovery (which of course is not over) and along the way learned a great deal - with the help of many - about speaker set-up, acoustics, electronics, music, (some Physics).