Avoid the PSP-3000 unless you absolutely have to have better LCD Response time. Image quality on a whole is degraded due to sawtooth like interlacing artifacts ,over saturated colors and poor screen uniformity
which model would you say is best? And what would be a decent price for it? I really haven't been keeping up with the PSP, because it always seemed rather expensive
Get a PSP-Go and hack it. It has the best screen out of all of them and 16GB of memory built in(Download any UMD games you own off the net and run them as ISOs off memory once hacked) Or a 2k and hack that.
I'm not sure about the E1k. The screen seems to be the same as the 1k with a slightly lower gamma. It's the only one I have not personally owned or tested so I can't vouch for it's quality. (Other than mono sound and no wifi)
I'm still hoping for a Resident Evil Sale. Since there was Capcom PSP this week. Maybe next week... :p one can hope