Thanks for the replies.
The disc that I lost in the lake was a Innova Leopard. It was part of a starter pack, of which I still have the putter and Shark. I was debating using the Shark for the cross-lake shot, as it was listed as a mid-range disc and of the two I'd prefer losing it. Given the result, it also would have been a better fit for the water it ultimately ended up in.
As it stands, I still have the Shark and putter, but I'll likely check out the Valkyrie, as that seems to be a nice disc.
While browsing discs online, I noticed that there are generally three classifications of Innova discs: Pro, Champion, and Star. The Valkyrie versions cost $9.95, $12.95, and $14.95 respectively.
Aside from the cost, is there any reason to not get a Star rated disc? Do the different classifications have different qualities (pros/cons), or do they exist strictly to provide various pricing/quality tiers?