Me and my mate have just started doing weddings and we have assembled a fairly good amount of kit for doing them (3 bodies and decent lenses) but I think one area were probably lacking is in flash. If we get stuck inside for a lot of our shots (quite likely this time of year in the UK) then I think were gonna struggle.
At the moment we have a 430EX each, what would be the best upgrades from this? a 580EX so we could conceivably have that on camera and 2 remotes firing at once ? Is there a better way to go without blowing a massive hole in a budget thats already been blown to bits and if a 580EX is the best way to go what extra bits should we budget for as well, umbrelas stands etc ?
Cheers in advance for any advice.

very pricey though with a starter kit that will fire just one flash remotely costing £300+ Think I will start with some from studio flash for £60 first and see what the limits of those are, £60 aint much of a risk and I bet they would sell second hand for not much less .. if not maybe more on ebay

