The SVT depends on status. By that I mean is it a refurb, usually these will have a reddish/plum colored bolt and electro penciled numbers. Also which aresenal made it can have a bearing. Lastly if it's a sniper model. A lot of them had the scope mount cuts in the receiver but unless it has the key way cut on top it never hand a scope mounted.
Here is some good info.
The SVT Section
Prices could be $700-$1,500 in my book
For the Mosin Nagants the Finnish models generally bring higher money than the rank and file Russians but there are also other countries that come into play as well as sniper model. Prices can run from $100 to potentially a couple thousands. More info at the same site.
Mosin Nagant
It's been years but I've still got a few Finns and other Mosins so if I can help you out let me know.
As far as SKS the original Russians probably bring the most followed by Russian refurbishes, Albanian, c
Chinese and Yugo in that order. Not sure what Romanians are bringing? They didn't import that many that I can recall and seems like they were never in the highest condition anyway.