Hi Andy,

Based on what you've said, I'd go with either Aweber or Constant Contact to manage your lists. They've both been around forever and have great reputations, but you should check them (and any others you find) out and compare their features and benefits to be sure they fit the bill for you.

Aweber's a bargain at only $20/month for unlimited lists and emails (up to 10k on a list) and CC is pretty cheap too, but their pricing is based more on the size of your list.

Oh, and if you want a real autoresponder that will send out a sequence of pre-written messages - Awebers the only contender as far as I'm concerned. Constant Contact doesn't do autoresponders, but Aweber does both AR's and your typical one time newsletter broadcasts.

HTH,

Steve