Commercial autoresponders such as Aweber is better than self-hosted solutions such as PHPlist just because of deliverability issues.
Aweber is very strict and requires double opt-ins and that may pose a problems for your business model.
MailChimp.com seems to be a bit more flexible in terms and more friendly toward API integration. I haven't used it personally but considering offering it as an alternative to the client that cannot accept strictness and inflexibility of AWeber.
I personally wrote integration script with AWeber and use it for a few years as well with no issues. So if you're basic starter WEB guy - Aweber is a good overall choice.
Gleb
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