Jimmy,
For 6 to 8k, I would say that the Audiogon world is your oyster! It all boils down to personal taste. And personal taste in this hobby varies widely from individual to individual.
I was also a "budding" musician, and still play feverishly (but not for a living).
I progressed through various two channel configurations and migrated to what I call, a "poor man's hi-end system".
First off, I pumped some serious dough into a pair of Dunlavy SC3's. These are time-aligned, phase coherant speakers that are very revealing, with a sweet spot that is smaller than the width of my head. But they sound heavanly.
They are fed with a budget giant killer pre-amp long discontinued by Adcom (former class A rated on Stereophile): GFP 750. That is feeding a Krell KAV 250 amplifier (250watts@8ohms, 500watts@4ohms). It is Krell's "Audio video line", not the high end line, but you'd never know it.
My Cd player has a tubed front end, and my phono stage is a tube Sonic Frontiers vintage phono pre-amp. So, I get the slam of the solid state world, combined with the warmth of the tubed world, and , in my opinion, it doesn't get any better than this. It took me about ten years to cull it all together, but I am loving it.
You can find used Krell, KRC 2 pre-amps for around 1,200. They are great pre-amps and always sell fast. Classe makes great amps, around 200 watts, at about 4 to 5 years old would cost you around another 1,200 or 1,500. Bryston also makes great amps that you can get great deals on (although some say they are a bit on the bright side, but they have a great warranty deal that is transferrable).
I'd keep that Mac, don't sell it. But there is so much stuff out there that is not that expensive that will fit the performance bill that I urge you not to spend all that cash when you could find an amp and pre-amp for half of that. Although I can't offer a suggestion of an e-retailer that will let your audition, you may be able to research the archives here at A'gon to scope out units to purchase used. And if you don't like them, just keep the packing material, and offer it up to someone else.
Good luck!