Email clients?

Thunderbird 2 finally hit portage recently, and I'm now even more annoyed with it. Some of you may know that I abandoned Firefox for Opera several months ago, and I have been quite happy with this decision ever since. I've also been looking for a better email client, but have thus far failed.

Basic requirements:
- Should be reasonably fast. This is why I'm getting annoyed with Thunderbird.
- Needs to run in Linux
- Needs to support IMAP
- Needs to support multiple email accounts (e.g. Jeffsweb and CMU) fairly nicely
- Should be stable

I have other more subtle features desired, but these are my basic requirements.

I've tried Opera's built-in email client, but it fails for one simple reason: it collects all emails from all IMAP folders into a single inbox. This is a major problem considering how CMU handles organizational bboards. So that's a no-go.

I hear lots of people raving about mutt, but it seems scary and I'm not sure how well it supports multiple accounts, anyhow.

Ideas?