just about any dps/healer combo will work fine...s/d, r/d, s/p, r/p, m/d, m/p...you have the ability to kill things fast and efficiently while still having the ability to self heal. if you want a little more HP/def also, go with a w/p, w/d, wdn/d...i'm srry knights, but knights are not used for much except bosses or places u need a tank, it has too little dps to be practical. in my opinion the best combos for lower lvl soloing are wdn/d, s/d and r/d.
i would go wdn/d/s because wdn/d is great for lower lvl soloing, d/s is one of the best healers in the game, s/d is great for party/utility play and has good survivability, s/wdn is one of the top scout dps combo's and wdn/s gets chiron the centaur
if you like pvp or dps more, then r/s/d is a great way to go also
but anyways, u pick a dps, a healer, and something else(maybe a tankier class, but it's really whatever you want) and you put them as your 3 classes, this will give you a wide variety of options
others may have other opinions, as this is just my personal opinion and as we all know this game is all about personal preference
