My PSP 1000 is starting to get like an old car...Replacing part after part.

Replaced:
LCD screen
Memory Stick
UMD drive

Need to replace:
Dpad pressure sensetive device (Does not like when I press on the right direction)
Dpad button (Had to cut the dpad in half and did a sloppy job since the new screen was slightly too big)
Start / home / select / ect pressure sensetivee strip (whenever I press one button on this strip, it starts spamming all buttons on it at once)
Battery cover (Lost it!)

So...Should I...

Get a new PSP
Get a PSP 1000 for parts (As in broken)
Get a used PSP
Get replacement parts individually