yea man. neither fit remotly similar. however, the krypton is a WAY better boot if you neglect fit issues. not only can the flex pretty easily be knocked up to raceboot stiff with a lil plug, but they are SUPER adjustable. and oh yea, the rampage sucks. get the cross. exact same boot with a way better liner in it. you can also get new, stiffer tongues for bout free.
as for the salomons, the foil is a far better boot than the SPK, which is a normal boot with tons of hype pumped into it. the only reason to buy it is the bottle opener buckles. the foil aint a bad boot, but if you want higher all mountain preformance as well, check out the guns from last year or the new falcons. both are super sick, and pretty good park boots. you may have to do some tweakin to get them to take the impacts you want, but thats pretty easy.
and, 350 aint that good of a deal. pretty much retail.