You might try Mozilla's Thunderbird. And you might consider IMAP rather than pop if that is an option.
I've used thunderbird for a while and its pretty quick, does everything I need, has a lot of the phishing stuff in there and lets you know when it thinks it is getting a scam email.
http://www.mozilla.com/en-US/thunderbird/
Eudora's 7.1 is nice for $19.95 (their free version has ads within which really aren't that intrusive)