Which Carry-On? Peli 1510/Lowepro x200/Think Tank Airport V2

I just booked my 7th wedding in Central America for 2012. I'm thinking it's time to get a bag that will carry everything and be airplane carry-on safe. I've narrowed my choices down to three roller bags and am looking for some advice from others.

Peli 1510 - Pro: Cheapest, most secure, hard case, safest if I'm forced to check as luggage Con: heavy, least spacious, might be forced to check in.
Airport Security V2 - Pro:Great construction, lots of space/pockets. Cons: might be too large to be used reliably as carry-on, most expensive.
Lowepro x200 - Pro: good size, plenty of good features, reasonably priced Con: Build quality compared to Think Tank.

I'm leaning toward the x200, but I've found the Airport Security at a reasonable price that has me tempted, but I'm not sure about the size. I have other smaller pelican cases and love them, but it might not be the best option here.

Which would you choose if you were flying south a lot this year?

I am using the TT International, holds alot of gear and have never had a carry on issue.

BF

I take a 1510 everywhere and it is not as heavy as most seem to think.
I am more concerned with the gear safety more tan anything else and the Pelican has no equal there.

Ed