i would say trek. they have a bike for every type of cyclist on the planet, from granny slow pottering down to the shops to lance armstrong to andrew shandro. their bike are built to a very high standard and they are excellent with the few warranty issues that they expeirence. they offer a lifetime warranty on all their frames, including their carbon fibre frames(this does not include crash damage) and they have no problem backing up this warranty. their bikes are very well priced too, simply because they use economies of scale to keep costs down, this is especially true on their lower end bikes.
also (before any says it) it does not matter that they are made in tawain, they are professionally built.
It only need 2 air shocks and a DH racing setup,that would be the ultimate race bike.I want 1 Unsecure image, only https images allowed: http://www.richi-engineering.de/bike/bike/hulk9.jpg
Hows about when the results are compiled we make a huge "V.S" thread and all the bike makes can engage in a big battle royale of pointless trite threads which serve no purpose other than to waste bandwidth?