I love my Nikon Coolscan 9000ED, and though it is old, I've had no troubles with it. Scans come out great, both in medium format and 35mm. I also had a Coolscan V ED which was also great for my purposes, but sold it after getting the 9000. I probably should have kept it since it is a strip fed scanner, whereas the 9000 needs trays for 35mm. That said, scans do take a LONG time to finish depending on settings, but for me, the results are worth it and I just love having a huge clean file that I can work with later and for archiving purposes.
I have also toyed with the idea of getting a good DSLR setup, but at the same time, I just like having a powerful dedicated scanner to get as good a quality as I'm able without going through a lab and not shelling out for a drum scanner. To me, having a desktop scanner is just about right.
Edit: It should be noted that NikonScan software is no longer supported on current computers, so I'm using VueScan, and works great. The other thing to consider is that the output cable for the Nikon 9000 ED is an outdated Firewire IEEE 1394, so you gotta get a little creative to get it to work. I'm using it on a MacBook Pro with an adapter, and have had no issues.