cheapest char:
fighter / barb
get str armor dex charm or the other way around (dex armor / str charm)
ee weps
at lvl 55 u shud hit 100-120 dex and 10 more str than ur dex (ex. 100 dex / 110 str , 120 dex , 130 str)
but it will be hard to climb in high lvls
i suggest u go mage
intel wep
intel armor
ee dmg charm
ee heal charm
put first 5-10 points into vita then rest into intel
mage is a lil more expensive just a little bit more but its way more effective. plus it can well white items which is a bonus for u.