The rev1/2 lights don't look bad( in comparison however.
..) but they revised the lights and IMPROVED them. They do update the look, it's like a few other stock things in essence could be updated/changed and the car could come out the factory new. Rev 3 all the way as far as lights go, I've only seen rev 1/2 lights actually look good a few times(where it made me want to keep mine) and it depends on different factors like the colour of the car(just like I think certain bodykits suit different colours better) and it might just be the rev1/2 center panel that puts me off, a colour coded rev 3 style panel might improve them.
(opens photoshop)And after all that.
. I've got rev2 lights, I'd switch to rev 3 in a flash if I could but don't have spare funds to spray on such cosmetics. 
PS: Anyone with rev 3 lights want to swap for rev 2's?
I think most of us can agree though, rev 1/2/3/5, it's all good except for those horrid lexus lights.
There's a reason rev1/2 lights are worth peanuts and rev3 lights need a bank loan to purchase... Just my thoughts anyway.
Anyway.
... to the original question, rev 5 or rev 3 I'd say.
