Rapha, nice but a bit pricey?

I went M in Assos and they fit perfectly. I am 5'6-7" and 31 waist if that helps.

I would also go M in rapha judging from their site. I am a M in all their tops.

I'm seriously considering splashing the cash on some assos bib tights. I'm Just over 6ft and around 31" waist, with a mega skinny ass. Would medium suffice? I've gone small on non-bib shorts before to get the fit, but I guess I need length of strap / leg too now.

Also... Rapha deep winter jersey - worth the £160? They look beautiful