Acrobard," I vote STR-based rog 5 / bard 15. Rog 5 gets you Staff Spec from Acrobat (+1 crit range & multiplier), as well as plenty of skill pts and some sneak atks; while bard 15 gets you Inspire Heroics, which in turn lets you take Inspire Excellence as one of your epic feats. The main drawback is lack of feats, but there's enough to take the must-haves (Power Atk, Cleave, GC, IC:Blunt, Inspire Excellence, Overwhelming Crit), with a few left over to round out your character.
DEX-based doesn't make much sense on an Acrobard: you can't take Imp Sneak Atk with this level split and with so few rog lvls I don't expect the DCs on Sweeping Strikes to be worthwhile; and as a bard you'll have both Rage spell and Skaldic Rage, which gives you +6 STR almost right off the bat.
All casters need base stat 10 + max spell level; so a bard 15 gets lvl 5 spells, they need CHA 15 eventually. But all bonuses to your stat from gear, tome, etc. count towards that total; so many bard builds (particularly DPS-focused ones) will dump CHA and rely on gear to make up the difference.Is cha important on bards? I have seen a lot of discussion in other threads trying to research and many of them are dumping it, why?
Your caster stat also boosts the DCs of your spells, which is why some bard builds go for max CHA. However, a heavily MCed melee-focused bard like this is better off skipping DC-based spells entirely and focusing buffs & heals.