Not sure what you consider "reasonably priced"...
430EX II is about $270 new (Amazon). You might find it for a bit less used or a refurb at the Canon online store.
It's a pretty nice flash... Plenty of power, without being too large.
You also might want to look at 550EX or 580EX, 580EX II used... these are larger, but have the advantage of being able to use with CP-E4 or CP-E3 auxiliary battery pack. If you are doing action shots, you might want an external battery pack to speed up recycling. (Also use quality rechargeable AAs in everything, for faster recycling).
420EX, 430EX and 430EX II can't be used with a CP-E4, but there are third party battrey packs that will work with them.