We've been trying to figure this out too. We have one commuter car and one large SUV. The SUV is staying, we use it weekends for hauling and for pulling the RV. Since we commute together, the commuter is piling on the miles, also it's a bit of a crappy car and keeps breaking. At only 160K miles it's close to the end of its usable life, sigh.
We're planning on replacing with a Honda Fit sometime next year, once we have the money saved up to buy it in cash. It took quite a bit of testing to find a car that was comfortable for both my husband and I, I'm 100 pounds and short and he's 300 pounds and tall.