since you have all Innova, I will stick with that. I like of the TeeBird. It's a fairway driver, and great for controlled shots where you do not need a bomb of a drive. I would get that (or the Discraft XL which is close to the same flight path), and work your way around after that. The best way to learn what works is to try it. See if you can find someone who has a lot of discs and ask if you can try them out because new discs can take a chuck out of your wallet.
You need some mids and fairway drivers: Leopard, Roc, Stingray, Whippet
I would say a Roc, and a Leopard would be all that you need for now.
To Compliment your Groove: Valkyrie, Roadrunner, Wraith
A Wraith and a Roadrunner should fill the voids in the driver group for now.
Get them in DX for now so they break in faster, and you get an idea of the true flight patterns of the discs and how they compliment each other. I never get my midranges in anything other than DX, I can get them to their true flight patterns after a couple tree slaps and being midranges and less apt to get slammed very often so they last a good while staying in the flight pattern I prefer from them. For Drivers I get them in DX, see how I like them, get a general idea of how they'll perform once they hit the sweet stage of broken in. If I think I can't do without that disc I will then replace with Champ or Star so it lasts long enough to get my moneys worth.
I actually have 2 Champion Valyries I got last year that STILL haven't reached that sweet stage of broken in. I'm thinking about slamming them onto the teepad before every throw, then once they do what I expect them to, stop abusing them. They are taking too long to break in lol. And I use them a lot.
It has taking some time for me to figure which of the 5 discs I listed worked the best for me. But now I feel more comfortable throwing the Stalker and the Leopard for those shots that are a bit too long for my other midrange discs.