I've got an old DW collectors that works great: 12,16 & 22. Coated emperors on top and coated ambassadors on the bottom. Coated PS3 on the bass drum. I find coated resos help darken and soften the sound of the drums with out having to tape the life out of them.
I find the 22x18 is fine. Some acts are even using 24's! I tend to like bigger, darker sounding drums for most modern country, ... nodding to the southern rock side of the genre. If you're going to be playing U2-esque disco beats along with banjo loops... you want a huge sounding kit. Check out Keith Urban's Drummer
http://www.chrismchugh.com
However, if you're playing older country... you might try a 20 or 18 inch kick. Either way, I think deeper is better for the kick, really lets you get "inside" the bass guitar's tone. Figure out which decade(s) will most of your band's music be drawing from and find drum sets and names of drummers from the era. Will you be amplified or acoustic? Will you be playing with an electric or upright bass? Kits are relative to the room and your surroundings I guess.
However, there's a youtube clip of Levon Helms (from the Band) telling students that if your drums don't sound right, just put some more tape on them.
http://www.youtube.com/watch?v=gRekuHyIgXU
So it really depends on how much you want to think about things.
Best,
Jonathan