I'd like to point out that using certain pieces of haste gear, namely walahra turban and swift belt, in specific DRG burn parties is a bad idea. The specific burn parties are those that don't have a RDM or WHM (why would you) or BRD. Note that this means you have no outside form of haste, all haste is from your gear. Also note that this is all assuming uncapped acc, so is mostly for use by not so pimped out DRGs.
Here is my reasoning:
Ohat provides 10 acc. If this increases your acc % from 90 to 95, you get a 5.56% ( 95/90 = 1.0555555... ) increase in total dmg. W.Turban gives 5% haste. With no other haste gear, that is a 5.26% ( 100 / 95 = 1.05263158 ) increase in total dmg. It would required having 5% haste prior to equiping W.Turban to be even with Ohat at 90% acc.
Life belt provides 10 acc. If this increases your acc % from 90 to 95, you get a 5.56% ( 95/90 = 1.0555555... ) increase in total dmg (same as above). Swift belt provides 3 acc and 4% haste. Assuming you have a 90% hit rate and no other haste gear, this will provide a ~5.9% ( 100/96 * 91.5/90 = 1.05902778 ) increase in total dmg (some reduction due to the -atk). This is better than life belt at 90% acc. They are both about even at just over 6.0% total dmg increase at 83% acc, assuming no other haste. Lower acc than this, life belt will win.
So for most DRGs, even those with little acc gear, swift will beat life belt (i have 2 acc rings,fowling, chiv chain, life belt, and full pole merits and get about 90% acc on colibri).
NOTE THAT the 4% haste is not enough to make W.Turban beat Ohat (assuming that the swift acc+ puts you at 90% acc, if swift puts you over 90%, then W.Turban wins), especially if your acc % is less than 90%. So stop using only W.Turban and Swift belt. Swap that W.Turban to your OHat.
REMEMBER, THIS IS ONLY IN CASES WHERE THERE IS NO OUTSIDE HASTE, I.E. SOLO AND IN DRG BURNS.
A useful observation:
When trading acc for haste (like with Ohat and W.Turban)
Let H1 = 100 - your current haste. (4 % haste would be 96)
Let A1 = your current acc % (hit rate).
Let A2 = your acc % after adding a piece of gear.
Let H2 = 100 - your haste after adding a piece of gear.
If H1 > A2 and A2-A1 >= H1-H2 then go with the acc.
For example, swaping Ohat for W.turban as above:
since 100 > 95 and 95-90 >= 100-95 we can see that Ohat is the better choice.
This originates from the way to calculate increase in dmg from acc and haste. Haste is calculated as H1/H2 (100 / 95 = 1.05263158). Acc is calculated as A2/A1 (95/90 = 1.0555555...).
Go throw this knowledge at those bandwagon SAMs w/ only W.Turban and sucking on acc.
Correct me if i made a mistake or two.
man, now i really need to go get a swift belt and stop drg burning in W.turban