He wants to play using a CFW. So atm 3000 is out of the question, as gamestops update their firmwares and retail stores usually only have new motherboards.
I'd suggest going to gamestop, go through their used 2000's, and try to find a really old one, possibly a darth vader white psp, or god of war red one. The god of war ones are supposed to use the older hackable motherboards.
Buy a second used psp slim battery and hardmod it with directions from psp-hacks.com or just buy a pandora battery, program the memory stick with some all in ones from psp-hacks.com and hack your psp to 5.00 m33-6.
One thing when looking for a used PSP, turn them on, and look REALLY close for dead/stuck pixels, if you think you found one that's perfect, change the background color to something dark, and check again. 1 stuck pixel ut of the way isn't bad, but if it has a couple that are easy to notice, then move on to the next psp.