The 190A8 for sheer kill to perk-point ratio is the best, if I'm not mistaken.
It's actually a monster too, if you fly it right you can hang with a surprising number of opponents of varying skill levels.
I actually happen to like the A8 as a fighter and I use it quite often (it's one of my top 5, easily) just for fun.
The offensive armament means that you really only need one snap shot at D400 to get a kill, so even if you can't hang with an oponent in an extended turn fight, all you need is that 1 chance to capitalise on.
Once you get good with the 30mm cannon you can pull some absolutely fantastic shots from D400 and further out. In any other aircraft these shots would just be a nuisance ping to your enemy. The 190A8 deals severe damage for very little ammo outlay.... and it has HEAPS of ammo.
620 rounds of cannon IIRC.
Forget farming perks, fly the 190 A8 for fun... you won't need perks for fun and if a situation arises that requires a lot of fighter perks.... you will always have them.