Im having the same problem, but with much research I've found out alot of things, even though Im not really a pro, I've looked up hundreds of videos and posts, so I do know what I am talking about
For VERY FAST Leveling/Thieving and low survivability (die alot) pick rogue/bard xbow. Not sought for in parties. Rogue/Warlock The one v one king and you are solo offenseive. You debuff, you put on extreme/DD you own you stun you sleep you own but you don't got the defense of the.. Rogue/Cleric, you put on these cleric buffs and DD/XX (Without these you aren't very good) and you pwn, but rogues are hit and run, even with cleric buffs you don't have master defense like a warrior.
I don't really know much about bard/cleric except support class, needs pt to be useful, slow leveling w/o pt. But cleric/bard I have heard good things about because of the support, noise etc. They are very effective in a pt, w/o one of these in a pt it will fail. They are incredibly helpful. I don't like support for the reason they can't dish out damage.
I love 2h warrior/cleric. Huge burst damage, great defense buffs and more. Also 2h warrior/rogue is cool if you have fast fingers.
I hate wizards. I know damage is incredible and invisible and BLA BLA BLA! Just picture this, Level 7, you got fire ball, one shotting enemies your level, your in the forest, a champion Logos something comes and shoots at you, guess what in 3 seconds your lying dead on the ground. I mean yea at higher levels you get bless spell, but either way, the second your buffs wear out, just picture yourself a level 5 with a champion logos guy right next to you.
I think for euros, sub should almost always be cleric or warlock (Cleric for defense warlock for offense)
On chinese side, pure str is dominate health and very stable pvp, I like hybrid spear as it has snow shield, moderate heath, and high damage, but not as high as pure int.
From what I have seen, I like 2h warrior/cleric, Rogue/Warlock.