well you got all the allied powers, now you just need a couple axis rifles:
1. Japanese Arisaka, a type 99 would probably serve you best as 7.7mm ammo is easier to find than the older 6.5x50
2. German Mauser or Steyr M95 straight pull
3. (optional) Italian Carcano, though 6.5x52 is impossible to find, a bugger to reload for and are generally held in low esteem by everyone but avid collectors.
Then if you really want you can go for some Neutral persuasion and get a swedish mauser.
then some other honorable mentions for the US are the M1 carbine and 1903A3 springfield.
anything other than those are incredibly expensive and a pain to deal with.
all guns lost in a tragic smelting accident.
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Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.