There isn't a compatibility issue if you use a fiber optic cable to trigger, unless of course nothing sends that triggering pulse of light. If a camera's on-board strobe can't fire due to not being able to pop-up (like a 7D in an Ike) that would be an issue for FO connections. Ike housings can use their hardwired bulkhead to trigger external strobes but...yeah. This only works on their strobes, at least for "true" TTL. The YS-01 doesn't have a hardwire connection option like say the YS-110A, so you can only trigger it via fiber optic no matter what housing.
What to do, what to do. If you go the 7D route and stick w/ an Ike you are close to 3x the housing cost of an Ike for a G-12 (around $1,500 vs around $650) and you would be upgrading your strobe(s). Not knowing your budget, another possible option is to go the G-12 route, use your YS-01 on a Canon housing (under $200.) or go for the Ike and then you can use your YS-01 w/ a fiber optic cable.
One advantage of going the G-12 route is that enough dives down the road, if/when a dslr calls your name, you'll have a lot more experience and could make a better overall decision. I'm just sayin' ...
I would check the Ike forum as Lwang mentioned, to get a sense of what else might work for you. // ww