I use the Aero P2 Strippers and they're great. I've had mine since 2010 and they're still in one piece. If you're not used to wearing thigh pads then the first 5-10 times you wear them it will feel odd, but after that you don't even think about it at all.
I'm 5"8 on a good day, so I use the P2's in a small size. They're light and not too bulky size-wise either such that the gap between the bottom of the thigh pad and the top of the pad is almost impossible to hit. I think they recommend the P1's if you're facing 80mph+ bowling but I've faced that sort of speed with the P2's and have found no issue.
RRP tends to be around £40 or so but if you're sharp online you could find some for £30.