Well, you must consider two things: price, once more; some kits have a good quality/price ratio. They have lenses that tend to be of a more generic usage, well adapted to most situations while not really specialized. Then, if you really want some specific type of lens and know what you're choosing, buying the lens separately might be more what you want. That last solution is always more expensive. So I guess unless you need that specific lens, go for the kit.

I'll add a tip: ask photographers around you, I mean the ones who dwell in small artisanal photo-shops, not the huge industrial ones. They could give you some advice and directions and might have good occasion material. Plus, most of them have reductions as professionals - if you become friend with a pro he might make you benefit from it.