My wife is a 1.58 high (or low!) chick converting from road to MTB. Probably extra small to small. We have been tempted by MomsenDual Link 6/7, Spark 35/40, Giant Anthem x4. 29er or 26? I'm not an MTB rider yet so am looking for advice from you experienced guys. Should she be looking at a 29er? She likes the idea of full suspension, mainly for XC/marathon riding. Budget around R20k. Please help with suggestions. Thanks.