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Hmmm the 1K range in bikes is uuuuber depressing and they are simply not up to the job of actually mountainbiking. Even if they do survive it will be a heavy nasty ride.

Go S/H, look for one from...

This will tick your boxes http://www.specialized.com/nz/gb/bc/SBCProduct.jsp?spid=61539&scid=1100&scname=Mountain

Anything less would be a waste

Where are you going to ride it and how poor are...