for RM1.5k... you won't be able to get much of the best MTB possible...

if possible, try to go for brands like giant, jamis, KHS, Fuji or Merida.. although not as big brand wise as Trek, specialized, Yeti and etc... but it is more reputable than many upcomming taiwan bike manufacturers...

RM1.5k should still get you 9 speed with some fairly good components with mechanical discs and entry level fork...

there is not point telling you which specific model to get since you might have personal preferences on how your bike is going to look.... try browsing the sites for the mentioned brands and see if you like any of their low end or entry level models...then try to find the shop that sells it to check out the price...

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Added on February 13, 2012, 10:48 pma new arrival...

in any case where the helmet took an impact.. it is better to have it swapped out... it could have already cracked without you noticing it externally...
the durango 2.0 is a 2009 model.. i think there is no more 2.0 in the new one... the replacement i think is durango sport... comparable to a avalanche 3.0 and xtrada 5.0... all 3 are almost the same... it'll be a better bet that the polygon might be cheaper but the jamis looks to have a better frame...