I agree - $340.00 is a good price as long as the work is done right. I mean, as dumb as it may sound, if a shop was going to do all this work for $100.00 you probably don't want them working on your truck. As far as doing the work yourself, the ball joints are fairly easy on this one - they bolt on. Packing/adjusting wheel bearings is pretty simple but a lot of people don't know how to do it and end up too loose (lots of wheel play like you have right now) or too tight (wheel bearing burns up).

'91 LWB, 31x10.5s, KYBs, A/T "I look like Robert De Niro, I drive a Mitsubishi Pajero" - Billy Bragg (not the original lyrics, but that's how he sang it when I saw him in Dublin in '04)