One of my projects is reviving a dead ThinkPad T430 I got in 2013. It's an Intel Core i7-3520M with 8GB of RAM. I originally got it with a 500GB 7200RPM HDD, which has since been moved into a T520, and I was thinking of getting my feet wet with my first SSD. I was previously concerned with their reliability, but it seems like it's a lot better now than it was when I first heard about them.
So, what should I go for? I don't need a huge drive, 250GB should be fine. I've got a second 500GB drive that will go in the Ultrabay for data storage.
Once I get the drive put in, my next order of business will be replacing the stupid chicklet-style keyboard with a classic layout from a T410/420. In the end I hope to make it a "poor man's ThinkPad retro"