Buy well, buy once.
The 430 is a cracking gun for the price, I think its quite cheap actually. Wont hold you back.
Very importantly, its guaranteed to work fully with all current and future Canon bodies, inc wireless ettl. Nissin, Metz, Jessops et al are all just interpreting the canon coding and signalling according to what they think is correct, whereas Canon know their own system.
Course, if you are looking for an rf602 trigger, then that's manual only, no ETTL at all. Any old manual gun will work fine in these circumstances.