Unipack / Create / Sports Direct singlespeed track bikes?

Clunge! Now there's a word you don't hear often!

My local bike shop is either a cyclopedia or an Evans cycles. What should I be asking for? I don't want to mince in there lugging the frame over my shoulder and wheel it out covered in over expensive and unnecessary crap!

Also, when I did ride it I only really ever used 3 of the gears, yet it has like 15 different combinations. Can I get it set up with just 3 or 4 gears?

Cheers!

There is shit load of information on conversions already on this forum and on sheldon brown's site.

Basically you want to get a new rear wheel for your trek or maybe get an old racer from ebay.