Good lord!
I think firstly you need to decide between quantity and quality. For example, my kit is worth around £1600 (well it was when new), but it is a Mapex M Birch. The reason is, I have two kick drums and five toms, with racks, pedals and all sorts.
However, you could spend the same amount on a three piece Sonor Delite or one of the other top-line series. It's down to what you're after really. As much as I love the super high quality jazz and fusion kits, I need my kit for my band and rehearsal commitments, so dropped down a few notches on the quality line to get more equipment that I needed.