My pleasure. I know that getting the gear together is a major expense. All of us went through the first time gear purchase. My advise is buy the best you can afford if it will meet your needs. Don't be shy about asking people's opinions at the camp out. There will be a lot of experience present for you to draw on.
Also, by the time you upgrade the SL4 to led, you could have bought a lot better light. For example, the UK C4 eled goes for about $130. For the same money you can get a MJ850. The UK Q40 eled plus is around $57, the Intova IFL660, the one I have, are $60 at Leisurepro. Both lights out perform their UK counterparts.
It's my personal opinion that all UK lights under perform for the price. Where UK is very good is warranty service. They are one of the best companies in the business on that score.