Wanting to switch from Science Diet Dental - suggestions?

I have two indoor 3 year old cats, Pixel - calico and overweight & Proxy - gray and good weight with prior history of tartar issues.

I just noticed Pixel's front teeth are MAJORLY worn down and it seems like she's missing some teeth and her poor gums are red in one place. I'm making her a vet appt asap (calling them on Tuesday). I'm worried that the huge hard kibbles are what have wreaked havoc on Pixel's teeth since she really chomps on her food.

I'd like to feed them a food that is healthy for them. From what I understand of what I've read I want to avoid corn and beyond that am overwhelmed. I put 3/4 cup of dry food out for each cat and they graze all day. We used to occasionally give them canned food but haven't in about a year. Should I try to get them used to feeding times and limit food availability?
Any suggestions? I'm thinking a mid to high price range but not too $$$$. Or could I mix a mid range food with an expensive food?

Please give us your idea of mid $$ and where are you able to shop?

I would like to know what's best and what's second best. I guess I'm not honestly sure of price ranges of foods. I currently buy 3.5 lbs for about $16. However we tend to try to do the best we can by our pets so I'd like to know the options. What I'm trying to say is the quality of the food is more important than the price. I'm also thinking of adding in some wet food for them too. I can shop at local shops, safeway, petco, target, and the like.
Thanks.

What's best will always depend on the individual animals. What's purr-fect for me might not work for you, as every kitty is different.

If you wish to go for canned & dry both - I feed a high quality dry & low quality wet. It works for me - and I was throwing out most of the high quality stuff as they didn't like it

Good brands (generally speaking) - and I'm hardly touching the tip of the iceberg here -
Chicken Soup
Diamond Naturals
Fromms
California Natural
Innova / EVO
Healthwise
Eagle Pack
Felidae
Wellness
Solid Gold
Nutro / Nutro MAX
Precise
Taste of the Wild
Orijen
Acana
Blue Buffalo
Authority (Petsmart Brand)
Premium Edge
Natural Balance
Purina Naturals

For me, I feed Taste of the Wild ($18 for approx 15 lb bag), Eagle Pack Holisitic ($35 for approx 15 lb bag), Wellness ($35 for 12 lb bag), & "regular" Eagle Pack ($25 for approx 15 lb bag). Yet, someone else will pay $25+ for the same bag of Taste of the Wild.