Any 2012 non retina model. Any of the retina MacBook Pros don't have upgradeable RAM.
My thoughts also. But, I would narrow it down and say that if your budget allows go with the 2012 and 2011 units. These have SATA 6 drive interfaces for higher performance with a modern SSD. My 2011 13 MB Pro shows about 550 MB/sec read speed. My 2010 13 MB Pro showed about 330 MB/sec. Both are much faster than the 50-60 MB/sec of the rotation driver, but you can somewhat feel the difference. The 2011 unit is a step or two faster, and at this point the price difference is small.
And when you do get an SSD, get one that is at least 256 GB. The way they layout memory arrays on the SSD the high capacity drives use more modules that can be driven in parallel so the performance increases as the size increases up to around 512 GB - 1TB, depending upon manufacturer. I find the Samsung EVO 850 offers great performance for the money.
Add a 256 SSD and 16 GB of memory to a 2011 13 macbook and they are very fast!