How many bikinis do you take away with you and how much do you spend on them?
I usually take 4 with me and generally buy a couple of cheap bikinis - H&M, Top Shop etc for my hols. Last year, I considered the merits of a designer spend...would they be better quality/make me look like a moggle etc. After much tinterweb searching, I couldn't stand to part with £90+ for a bikini so took myself off to TK Maxx where I bought a Michael Kors number for a bargainous £19. I can honestly say that whilst my eyes would water at the original £90 price tag, you can seriously see the difference. The fabric is so much better, holds you in and gives excellent cleavage (even though tis not a "support" garment and tis a string bikini).
The other issue is bottom coverage. I found myself scoffing at the idea of Brazil cut bottoms (very high cut at the rear, leaving a good proportion of exposed bottom but nowhere near thong like) much preferring a good amount of lycra fabric over my backside. However, my Rip Curl bikini has exactly those style bottoms and OMG, reduces your bottom to half the size!