I thought long and hard about getting a Time Capsule, but in the end I decided to go for a DIY 750GB external that is partitioned into three logical drives:
1. Daily SuperDuper! clone (190G

2. Time Machine backup (318G

3. Weekly SuperDuper! clone (190G

just in case something goes wonky and I've already done one or two clones onto the daily drive.
What I am *kind* of hoping to happen is my reasonably elderly DLink router to finally collapse, in which case I may spring for both an AEBS and an Express.
David