The CP88 and CP99 come on here quite often, so again buy off this site and save a few quid, plus they will already of had a tin or 2 threw them so they should be nicely bedded in.
it's really tough call between the 2 unless you bring the CP88 Competition in the frame, the comp is the same but has the 6" barrel so it's more accurate. if you can stretch to it go for the 6" Competition, I have had all three and the comp it by far the best, but for sheer pleasure and fun it would have to be the CP99.
atvb
Jason