If you mess with the Xfire enough you'll encounter a few screws that are in spots too tight for "normal" tools to reach. I'd previously bought this Lisle Tools 26000 set (picture included) for tamper-proof Torx, but they work on regular Torx too. The 'bit' design means they fit into my 1/4"-drive pass-thru ratchet. Using them together saved my *** when I encountered some otherwise inaccessible T30 screws. However if I weren't such a low-life tight-wad I'd buy this set:


And if I were TRULY WELL-HEELED I'd pull the trigger on this one (yummy!):


Alternatively you can search '1/4" drive low profile ratchet Torx'. This set has every Torx bit from T8 to T40 and is SUPER-LOW-PROFILE!!
If you DON'T NEED a ratchet this seems like a particularly good price for both tight-quarters bits and long ones too: I bought a set of 4" & 6" long Torx bits that I used for removing the steering wheel.