If you import it into FCP6, FCP gives you a 720p50 timeline compressor setting. Works fine here, and we've been using it a lot lately with HVX200 footage with very respectable results. Especially so if you're going to DVD as it scales down very well and without a lot of gamma shift. Depends what you're delivering of course, but if it's this kind of workflow, it's well worth the upgrade to 6.
Clay