Firstly mate, i too own an icafe in CPT, and my advice, is that, firstly an adsl line, or even 10 of them would not be substantual to successfully run an I Cafe.
We are currently pushing through +- 70 gigs of http traffic on a slow month with a no downloading policy enforced.
Secondly, if you are as serious about your business as we are, then who the hell in their right might would use SAIX as an ISP?