I wouldn't bother upping it beyond say an Antec VP-450. That build is not going to consume all that much power what with a graphics card that maybe breaks 100W, a CPU that won't even break 50W, and the rest of the system won't break another 50W. We're looking at maybe 50% utilization on either PSU and there's even some room to grow from there along with plenty of buffer from from degradation over time.
I can't argue against considering an SSD. SSD's can be extremely convenient and not just for boot times. Loading times on pretty much everything storage-performance-related are made greatly faster.