I use Wellness canned foods and have always been happy with them. I have 7 cats that love Wellness. I'm not concerned with the garlic content (partly because canned food is only a small portion of my cats diets and I rotate dry brands so they are never consuming much garlic anyway) although I do...
If you suspect an allergy to corn I would also avoid foods containing corn gluten meal as it is the protein/gluten in foods that most often causes the reaction.
I think the NB venison formula would be a good one to try. I've been very happy with the NB ultra formula.
I hate to bring it up because I can't remember the details but there is a specific reason (possibly toxins getting into the food or something once the can is opened?) that I stopped leaving leftovers in the cans. I put the leftovers in a plastic zip lock baggie now.
I like to rotate brands every couple months.
I avoid ingredients such as meat-byproducts, unspecific meat meals, beef tallow, unspecific fats (such as "animal fat"), corn gluten meal, soybean meal, artificial colors, flavors and chemical preservatives.
The Dr.Elsey's Precious Cat litter is 99.9% (or something like that) dust free. Its a clumping litter and comes in several formulas including unscented. I've been very happy with it so far.
I mostly use Innova, Wellness and Eagle Pack and I rotate amoung those. A couple of mine are picky about texture and these are 3 brand that all 7 of them go nuts for.