If I didnt have other games, and I already didnt have premature grey hair coming in, I'd do it. I ordered TR II and III used this weekend, I already have part 1 and chronicles, I plan on running thru TR series in it's entirety.
I really liked the first game, liked the second one a lot less, and didn't like the 3rd one at all. The TR series just seemed to diminish as it got older.
Speaking about running through a series though, I can't wait to someday have the time to play all the Resident Evil games. I've finished them all already, but I want to play them again back to back.