in the effort to keep stuff flowing with out combat bogging down every little thing here's my idea for how to handle it. Rather than a round by round it'l be more of a win or loss roll for the typical "trash" fights with "boss" fights being handled differently.
"Trash" fights would be 1d100 modified by a characters "combat potential" which is HP+AC+max damage+level
Such as bob is a level 8 fighter specialized in the two handed sword with a damage bonus of 2 from his strength. Bob has 50 HP and his AC is 3.
A 1d100 would be rolled, say he rolls a 30. That 30 would then be added to his personal "combat potential" He has 50 HP that would be added to the 30 he rolled giving him 80. Being level 8 and specialized in the 2 handed sword he gets 2 attacks a round. The max damage of a 2 handed sword is 10 (always assume a small/medium creature), because he gets two attacks a round his max damage would be 20+2 for specialization plus another 2 for his strength bonus for a total of 24. The 24 would be added to his earlier 80 now giving him 104. His AC is 3 which is an improvement of 7 from the starting AC of 10. So he would get 7 added to his roll for that, taking his 104 up to 111. Lastly he is level 8 which would add another 8 giving him a total of 119.
Bobs "combat potential" is 89. Having figured that out when he gets in a fight it would simply be a 1d100+89.
Bob fights a goblin who has a total roll of 118, very close but since Bobs roll was higher he beats the goblin with out taking any damage.
Bob later fights an orc who rolls a total of 159 this time Bob only managed to roll an 11 on his 1d100. Adding that to his combat potential of 89 bob ends up with a 100. Bob kills the orc but loses some health because he lost the roll.
The idea being that if you manage a higher roll than your opponent then you win with out taking any damage. If you roll lower you win but suffer some HP damage. HP would be lost at a rate of 10% of Maximum HP for every 10 that your roll gets beat by. In the above example since Bob lost by 59 he would lose 50% of his HP. If he lost by 1 he would lose 10% if he lost by 100 then he would have been slain.
Another thing to take into account would be tactics. Which would be a penalty I would apply to the "bad guys" rolls based on how the character approaches the combat. But i'll get into that if anyone thinks this sounds fair in the first place.
My idea behind this is it would allow stuff to move along with out getting bogged down by combat. With the player usually winning (as lets face it they usually do, cause well if you lost a majority of the fights you were in everyone here would've had 20 different characters

) but it certainly isn't guaranteed, because well lets face it some times those 1's happen.
The formula used is relatively complex but the good thing about it is that once you have it figured out, it doesn't change unless your character changes. Lastly i'm more'n willing to help anyone figure out what their "combat potential" would be if this method sounds good.