I think 2Checkout is alright. You don't actually process the users information on your site, therfore no SSL certificate is needed for that. You also are not required to be a certain age, or need to fax photo ID, and all of that, which I find is a hassle. Anyways, I would stick with PayPal, can't go wrong there, and 2Checkout, or if you are a bigger company, I suggest Authorize.net or another merchant account like that.