I was going to buy 430 EX flashgun but now that 430 EX II is in shops I've got a big dilemma. 430 EX II is 20% faster than 430 EX and has nine custom functions, but is this enough to justify £50 difference? So should i go with 430 ex or slightly better(?) 430 ex II. BTW I haven't owned a flashgun before so I'd really appreciate some help.