Mesh... as much as SATA 3 and USB 3 are anxious:

1) You can at all times purchase an expansion card later

2) eSATA can be used in substitute of USB 3.0 immediately (just may not be hot-swappable)

3) SSDs are actually the only belongings which will fully use the speed and they aren't cheap enough or fast sufficient to justify waiting.

4) CAT 6 cable + Gigabit routers are the way to choose fast home-networking

5) Did I mention you can just purchase an expansion card when the time approaches?