98bhp engine then. A panel filter combined with a good exhaust manifold (thus removing the CAT... a Piper 4-1 is where my money would be spent) and exhaust should see you in the region of 108 - 109bhp.
Things start to get expensive from there - fitting an aftermarket cam means removing the head, so that's a new head gasket, new head bolts, new cambelt kit etc. You can fit something like a Newman PH3 or Kent PT40 and run that unmapped, but at the bear minimum you'll want to fit a vernier pulley and have the cam timing adjusted on the rolling road. The results of that should be around 118 - 119bhp.
If you're gonna get it remapped, fit uprated valve springs - this allows the mapper to raise the rev limit a tad. This will stop the car dropping off cam as much when shifting through the gears. Although to be honest, I never felt that was a problem with mine which had an unmapped PT40 - I doubt it would have gained much more with a remap. It drove very well, idled perfectly, used no more fuel etc.
Modding the VTR to get decent power is expensive, but once it's done you'll find it's a lot more cost effective to run than a VTS. The valver is a very smooth engine though and there's a lot more to it than an extra 8V - you really need to drive one to see the difference.