Adrian Flux, Sky and then Chris Knott - Do it in that order and play them against eachother!!
I paid £440 for a modified policy (decat, BMC CDA, 180 brakes) last June and I was 22 with 4 ncb.. Expecting it to be higher this year as I'm going Fully Comp - can't justify the possibility of loosing my 5 years no claims so need to protect it!
If however you don't care about no claims, or have none then I suggest getting TPFT and staying away from Fully Comp - lets face it; if you have an accident in a ZS then it's going to get written off anyway!