The standard silicone (eg. GE I) that you get at the hardware stores is fine for most applications. GE SCS1200 is what manufacturers use for their tanks if you want the strongest stuff. The whole "don't use for aquariums" is just legal butt coverage. Any 100% silicone is fine as long as it doesn't have any anti-mildew agents (usu. found in "Bathroom" versions).
I got my GE 1200 at GE Polymershapes off United Blvd in PoCo. They don't normally do retail sales so you might get some funny looks there. They actually gave me a tube for free since it was nearing its best before date.
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