I split them based on writers, with the first bind going up to issue 20 (the last issue Grayson co-wrote) and the second containing the rest of the series. Volume 1 is 1.5 inches thick and volume 2 is 2 inches, so trying to do one big bind might be a bit large, though mine included the JLA/Titans crossover and some other stuff as well. Here are the full maps:
Volume #1
JLA/Titans: The Technis Imperative
Titans Secret Files 1
Titans 1 - 9
DCU Villains secret files 80-page giant (pages #60-61 only)
Titans 10-20
Titans Annual 1
Volume #2
Titans Secret Files 2
Titans 21 - 50
Titans: Graduation Day 1 - 3
You could also throw Titans/Legion: Universe Ablaze #1-3 in somewhere, but it's more Legion-centric and I don't know where exactly it would fit continuity-wise nor is it ever referenced I don't think.
And krisis, what happened to your library room? I consider myself extra lucky because my wife is a big geek too, so has no problem with my collecting. Plus I work from home, so my office can't ever be co-opted for something else