alright bud. I not sure if this will help but i would recommend isis bb as square taper easier to round causes cranks to feel loose. trial tech cranks have had a good word said about them and not that expensive either, echo cranks are not that much but heard a few cases where there feel loose even when tight giving a little play on them. echo bash or trialtech depending if your wanting to save .1 of a pound. i am not sure if your frame is 20, 24 or 26 i presuming as your after a little seat it'll be 24 or 26. 26 tyres are usually maxis high rollers, tryall and few riders like the kenda all personal preforance. the maxis and tryall very similar but looking extra 10pound for just back tyre for tryall. tryall stem over the monty as if you see the top angle of monty stem is for the monty forks which come on an angle. If your frame geo has a high bb its recommended you use a high stem likes of you gu tp etc. from about 45bb rise plus would recommend high. i not sure about seat tube either i never rode a seat i have the gu tp 08 i love it feels really nice but sounds if you'll be popping 360's out rather than t.g.s trials (tap, gap, side you will here this term some time) i hope i helped in some way bud. ste