Another place you may want to consider is the Wakefield/Milford Lake area. When I lived in Manhattan my buddies and I would hunt up there frequently. There's a lot of heavy cover that's surrounded by crops, excellent for quail - and it's usually good for a rooster or two. It does get hunted rather hard in the first few opening weeks though. The North side of the lake (North of Wakefield) has always offered the best ground, but there is some nice ground on the South end of the lake as well. You could easily spend an entire day hunting the lake property and surrounding walk-in areas. Please note that I have not been to that area yet this year. I do know of a grass patch that is kind of "hidden" though, and probably doesn't get hunted as much as the rest of the areas. I few years ago I pushed about 40 pheasant out of it.
Should you decide to head that way, you can lodge in Junction City or Clay Center. Also, should you decide to hunt any Wildlife area near a lake (Milford, Glen Elder, etc.), pick up a lake map at the visitor's center. You'll find it much easier to navigate around the lake areas using the lake map, rather than the walk-in map.
Good luck!