Xplicit

I have a %100 double optin email list I with a little over 100,000 subscribers gathered from my sites over the last 3 years.

I rarely use it just because I often forget I even have it, and im using a crappy free script to manage it.

I need something that'll let me scheduel mailings in advance so I can setup like a months worth at a time.

Whats the best script out nowdays that isnt too expensive (or free) ?