Hi Jennifer...... welcome to the DIS family!!
You will LOVE CSR!! it's my favorite along with many of the posters on this thread. and definitely a "wealth of info"!!
even tho you have a car.... I'd suggest the bus to MK. parking/tram/ferry/etc eats up alot of time at MK. driving to the other parks is fine, but not MK.
We stayed in 6B one year.... great location! close enough to the pool but not as "busy" an area as 8A. 7B would be great too. both 6B and 7B are in Ranchos. and close to the bus stop if you need it, and there's laundry at the quiet pool right between 6B & 7B.
and when you need to go to El Centro, cut through the Dig Site area and follow Lago Dorado to it... not a long walk at all.
have fun!!!!!!!