Well I can't say I have "specific" weight or height, because, for one, I'm quite poor at judging those things. But if we are talking about standards, then I'd say I wouldn't want the woman to be in either extreme end in either category.
As long as their under 5'10 they should be alright considering I'm like only 5'6/7ish. As for body type, I prefer curvy girls or thick girls (not to be confused with fat). They can weigh whatever, if they look good. I know this one girl whos like 200 pounds, but she is like 5'10 and has a thick build, slim waist, that's just her body type. If their obese, then that's a no no. So to sum things up, just be in reasonable shape. Oh also I'm not that into real skinny girls, I can be attracted to them, and I have in the past, it just depends on the girl and if we have chemistry or not.