Thanks for all the good advice offered.
I just got back from my first ride on a Specialized Hard Rock A1 comp FS (Y2K)I purchased this morning. I decided to go for the ally framed version, though it cost an extra fifty quid, however with a bit of bartering the shop threw in some lights and a pair of bar ends. The bike is light, responsive and gives you a feeling of totaly being in control over rough ground.
Thanks once again for the advice, one very happy shopper!
PS. so glad I didnt buy the saracon D-tox!