Hi,
Your best bet as regards to alarm systems would have to be a clifford. Clifford are able to offer many features and will happily work in conjunction with a turbo timer.
Your correct in saying that the standard traction system is as good as it could be. The standard traction system loses you power as it works by closing the throtle. Raclogic offer a good traction system which won't reduce power as it works by cuting the injectors instead of closing the throtle. Vortex Power offer the racelogic traction system in two different packages.
1, Racelogic traction control (supplied only) £535
2, Same as above but a supply & fit package £676
I think this is one of the most important and a well worth mod. you can find info about this at http://www.racelogic.co.uk. or you can search this forum.
Hope this helps.
Mark