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Well. First thing, Lance Armstrong races 'racing bikes' not mountain bikes Lis 
It depends on your budget mostly, each brand has a range going up the price scale depending on budget & style of riding. Since it's you and the bf, you're probably not going to want some trials type bikes (for stunts & shit) but I'd say a Hardtail (front suspension only) is your best bet, or even a hybrid if you don't plan any off-road riding at all.
As the price goes up, the quality of the groupset goes up too, usually Shimano or SRAM, means lighter, stronger, better working bits. For a price of 800-1000 dollars per bike for example you'll get mid-range deore or LX components. For cheap bikes you'll get the very basic which feels rough as hell to shift gears & so on. It really is one sport where you do feel the difference in quality parts
Brand wise look for
Kona, Trek, Specialized, Haro, Gary Fisher & GT
They'll have budget bikes (from about 350-400 usd ish i think) to the 8grand carbon fibre race ones
And ygrene, whiskers & boomer are also very knowledgeable 
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