Hmm, a big jar with a motor on top sounds like an older Eheim model - those are wonderful filters. Go to bigalsonline.com and check out the larger filters, Eheim Professional II if you can afford it, or a Rena Filstar XP3 plus maybe a large HOB
by AquaClear or Emperor to work in conjunction with the canister.
It will also depend on what kind of fish you will be keeping. If we are talking oscars, you will want to overfiltrate, rather than get what is rated for a 90gal. You might also want to look into Ocean Clear filters - I do not have experience with them but have heard many good things about them. You can get one one for a 90gal, I'm just not sure which model.