Scimitars are a better crit profile than khopeshes, and you get +4 damage and 3% doublestrike as elf. You lose a little base damage but I believe the crit profile makes for higher DPS. Using scimitars also means the human feat is basically null because you don't need khopesh proficiency.

You don't have to spend a ton more AP in elf than you would in human for damage boost, and healing amp. You would have 8 there anyways. The human build is probably higher DPS, given damage boost and more AP for sneak attack from DS (1.5x melee power affecting it currently). Human can afford killer and sneak attack from DS potentially, which is a lot of potential DPS.

It is still better to go STR based elf IMO. Str can get higher, and allows you to use stunning blow, along with it is difficult to fit a dex item into your gear with the way the RNG loot works.

I will be posting my STR based elf build that Dispel is dick riding soonTM. My gear is not done and a quick EE cabal first boss DPS test puts me a little above 6k DPS on non helpless mobs. I will probably end up around 7k DPS as a str based elven ranger, while maintaining a 95 DC stunning blow and 105 DC dire charge.

just to nit pick a little

14-20/x3, 14 "extra hits"
16-20/x4, 15 "extra hits"

Without deepwood:
15-20/x3, 12 "extra hits"
17-20/x4, 12 "extra hits"

Elves should look at balizardes as an option.  +8 2.5 (1d8) 15-20 x3 rapier.

Anyone have some math to show this one way or the other?

I will assume LD and Overwhelming Critical.

14-18x3 - 15
19-20x5 - 10

Scimitar is 25

13 Regular Hits - 38 over 20 rolls with 1 miss

16-18x4 - 12
19-20x6 - 12

Khopesh is 24

15 Regular Hits - 39 over 20 rolls with 1 miss

FTFY

Surely you put points in DWS cores?

so youre using called shot in a comparison of weapon crit profiles...? lol. it would be a factor in dps comparisons, but not in a 20 roll weapon profile comparison. it is every 6 seconds and also affects multiplier. I dont see the multiplier in your "math". also i only put 1 point in DWS. no AP for more if I want to take know the angles for 10 damage and 10 combat DCs. elven tree has 19 points in it.

Haste boost gives you FAR more DPS than damage boost; try it.

Elf is always bad for EVERY melee or ranged because you are losing 20% dps. Flat out. Human damage boost is the best racial ability in the game and costs one point.

Called shot is not significant. One attack every six seconds is negligible.

As someone who plays a dex based Human scim tempest, I can tell you anecdotally as well that khopesh dps is better.

Scims are 14-20/x3 and khopeshes are 16-20/x4, end of story.

15-20 and 17-20 in legendary dreadnought. lol divine crusader.

You won't have to acquire Weapon Finesse if you've got at least 3 levels of Ranger. The 3rd level Tempest core lets you use Dexterity for attack while dual wielding. You can get Improved Weapon Finesse from DWS, which lets you use Dexterity for damage with any weapon you can use Dexterity for attack.

Anyone have some math to show this one way or the other?

Last I checked, Rapiers aren't considered light weapons.