There are other problems with Excalibur as well.
Gamelink doesn't rent but if you have a fast connection you can watch video on demand (streaming content) and DivX movies... But I never use Gamelink, as they are sinfully expensive for both purchase and VOD.
There are some other sites that do streaming content of mainstream adult movies as well, but again... a fast internet connection, and a willingness to deal with much inferior quality is something you must have in order to want to go there.
I'm curious as to why you're avoiding XrentDVD. Have you had a bad experience with them? In my (and many others here) experience, they are an excellent company.
ML
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