Don't miss out on the superior versions of FFI and II. It's a very, very cheap game, and you can buy it for less than $20 on Ebay or similar. Anthologies has horrible loading times, and the extra features aren't really anything you couldn't get outside of a walkthrough/watched the FMVs on YouTube. You can also just emulate the SNES versions of FFV/VI, and wait for VI to come out on the GBA. Get Origins.

Chronicles, however, has no loading times (except when saving, but you should use the Memo Save successfully in that game), so you can still get it. Though, it would be better to get the GBA version, as it hasn't really been downgraded in difficulty (faster =/= easier necessarily), and it has a good amount of bonus stuff. Though, Chrono Trigger in that package is rendered virtually unplayable. :/