Some interesting posts in this thread. I can't imagine going back to less buttons on my mouse, but some of you guys have me thinking about it ;)
Naga and a Corsair K90 (purchased yesterday)
I have used the Naga epic, but it died within a month. It was purchased to replace my original Naga which I thought had tracking problems - fortunately it turned out that I just needed to switch mouse pads - it's still going strong.
The Corsair K90 is only a day old, but I like the feel of it so far. It's replacing a Razer Black Widow Ultimate - the T key stopped working (wtf) and it was about 3 months old. I've also tried their Lycosa and it had a similar issue after a short amount of time. They had a nice feel while they worked though.
I'm a big fan of Logitech's 'Illuminated Keyboard' (no obvious model number) for it's low profile and laptop feel (and it's clear blezel border was nice in that it matches the samsung I play on) but I wore it out and haven't been able to find a replacement. It looks like they don't make them anymore : /
If I'm away I use a maxed out G74SX