Halfords are also renowned for selling some first class bikes at very reasonable prices. Carrera, GT, Voodoo, Boardman, all excellent quality at their specific price points. If your principles over a crap footpump stop you considering them as a possibility you lose out big style. You asked how to spend 1200 on a FS bike. That's already bargain territory for most manufacturers. Look at Cube XMS, Giant Anthem X4, hailed as the best value XC susser by What Mountain Bike for a couple of years, and shop round to find X3 ( a spec level better, within your budget.) A Boardman Team will be lighter though!
Serious bumps on hills can be tamed by a quality hardtail with quality forks. A 120 or 140mm travel HT will eat most terrain. Cheap end MTBs with undamped forks will suffer.
Whats so reasonable about the price of one of them? In anycase if I was going to buy one I would go to an actual porsche dealer and not halfords. Also im not basing my principles over a single item but over a range of items and rediculous problems with my 1st bike I ver had which happened to be from helfords. When I took that bike back for a refund, I noticed another customer complaining about a snapped bicycle frame. Also others have mentioned poor experiences on the net.
As for my mountain bike I have decided to save up a bit more and get one in the summer. Also whats the advantage of so called "upside down forks" and "telescopic forks"?