"17,22,223,243,270,30-30,30-06,
7.62x39,7.62x54 .... .357 mag, .45 colt"
Well, you're not far off - since you didn't say for what purpose, I'm going to assume the purpose is to be more like me; therefore, you should get rid of these:
.270 win
.30-30 win
7.62x39
7.62x54
Keep these:
.17 (I'm gonna assume .17 HMR)
.22 lr
.223 Rem
.243 Win
.30-'06
.357 mag (rifle)
.45 colt (rifle)
and add these:
.280 rem
.280 rem AI
7mm RSAUM
.375 HH Mag
.260 rem
.22 mag (several times over)
.17 hornet
.357 Max (rifle)
.45-70 govt
But yeah, what are you trying to do?
If you don't have a .22mag, then without a doubt, that's it. Levers, pumps, turnbolts, semis - it's all good - great chambering. Cheap and super-versatile.
Someone mentioned getting a big boy -if you do, all of these are very good chamberings:
9.3x62mm
.35 Whelen
.375 HH mag
.338-'06 A-square
even the .375 win has a certain appeal for me
If you might go to Africa, choose the .375 HH mag..... if you're not, one of the other three there.
I had a CZ 550FS in 9.3x62, and lemme tell you, selling that was in the top 5 dumbest things I ever did!