I found two 325 watt panels on Craigslist for $400/each in Chicago ( use a nationwide craigslist search engine). Had them shipped freight ( freightquote.com ) for $150. I used 4gauge jumper cables to wire from the panels to charge controller. Pics of my install here:
Bought two cheap power splitter blocks on ebay to use in a combiner box. Also on ebay, were two high-amp circuit breakers (used in stereo systems too); one goes one each side of the charge controller (PV in, and 12V out). I use 4 golf cart batteries I bought for $70 each at Sam's; I originally bought 6, but I wasn't using as much power as I'd planned. I'd buy AGM batteries if you can afford it; I have to check the specific gravity and add distilled water to my lead acid battery cells once every couple of months, plus I could charge AGM's at an uncapped rate ( lead acids need regulated ).
I bought a MidNite Classic 150 charge controller (90+ amps, MPPT); it was the nicest and largest controller on the market two years ago and probably still is. I use a trimetric battery monitor that gives me a clear and simple view of the state of charge on my battery bank.
I'm pretty happy with it. In summer, I run the vent fan 24/7 plus two more inside all night. With that plus my marine fridge, lights, and laptop, the bank is almost never discharged past 80% in the morning. In winter while not running fans, it's never below 90%. Staying above 70% is the number most shoot for when designing your system (best balance of weight and battery longevity), so you could probably do okay with 2 batteries, though Tynan drains his two down to 50% each night.
I use this guy as an authority in solar/electric design: http://www.jackdanmayer.com/rv_electrical_and_solar.htm
A lot of sharp members in the Escapee forum too. If Tynan's old forum is ever archived, there was valuable information shared there too.