Just another alternative for you - I've been really impressed with the few Outlaw Audio systems I've listened too as well...prices are pretty good. Those M-Blocks they sell are great for building in stages.
But yeah, audiogon.com or even ebay is probably the most cost-effective way to start out. Generally people take good care of their equipment.
NAD, Rotel, and Adcom are very good (but very different) and can always be found for sale 2nd hand at a decent price.
The best part about building in stages with 2nd hand equipment, is you can usually re-sell the stuff for about what you paid for it as you continue to upgrade.
Cheers!