What's your budget? Very often you can find pretty good deals through newegg that way you don't have to worry about pickup's and all that. Once you factor in fuel charges, stress, missing boxes ect it's almost better to just get one cheap from Newegg.
Otherwise Craigslist is the best place to find high-end gear for a low price. Chances are since this is your first post here you don't really know what you want, so let us help you.
Post budget, use, expectations, WAF (wife-acceptance-factor) "does your significant other need it to look nice", and room size.