I have two M-38s, a M-91/30, M-44, Romanian PSL, and a Soviet SVT-40. All of them original, all numbers match.
The PSL is an overgrown AK. Get one originally made in Romania and you can't go wrong.
The SVT-40 is amazing. The blueing is more durable than anything else on the market- that gun will not rust no matter what you do to it. I find that it uses the crappy MN stripper clips well, the ones that suck when you try them in the MN. The SVT-40 is light, accurate, with low recoil and excellent looks. Heat is not something known to this gun, its design allows for extremely rapid cooling. However, PLEASE use non corrosive in your SVT. The SVT system is fairly simple to someone who knows what they are doing, but it can be difficult to some and if it is to you then keep to NC. Olympic NC can get as low as $4 per 20.
There are also DP-28 kits in the US, 99% are Polish, the DP-28 is the cool LMG used by Russia that had the top-mounted 47 (or 49, and in the tanker models 60) round drums. It went out of service in the early 50s.
Then the PK and PKMs already mentioned.
Then the Dragunov, the Soviet military sniper rifle which is like a hybrid between the AK and SKS.
Then the NDM-86, the Chinese Dragunov copy that came in 7.62x54R and .308,
Then the Tigr, the Soviet commercial Dragunov that had a shorter barrel.
Then the AVT, the automatic version of the SVT. To my knowledge, none are in the US.
Then the AVS-36, semi-auto, basically a really early SKS that took 7.62x54r.
And of course there are many oddball variants of the Mosin Nagant... the M-91/38, the M-1907, the M-27, the M-28, the M-91, the M-39, the Type 53 (Chinese variant of the M-44)... and the list goes on.