To answer you're question id go for a twohander for the syle (it looks cool on you're bak). Or, there are other options:
1: Shield and a mace (for the masive smash crit damage and the def)
2:Claymore for just something diffferent, you no something different from duel wield.
3. A bow and arrows for long distance and also for the style (bow and arrow look quite nice to be on someon's back)
4. Another pair of duel wield weapon, preferably broadswords gladiuses or bastrd swords. I think id recomend this one the most if you'r egoing for all out melee. This way if youre sword breaks then you can quickly switch and stay alive.
Then again, i agree with halflifefan, the 2nd slot is totally up to you based on what syle you want to use and what you want it for (dmg, looks, usefulness, etc).
IGN: Thorns
Guild: Unhinged (Tarlach)
Motto: Live future tomorrow.
Region: Southern Ontario, CA