If I got a belt-fed... well then I would be rich, because they run well over a thousand... and it would probably be an RPD. I have tons of 7.62x39mm, and besides, a 1919? .30-06 ammo is around $0.40 a pop for non corrosive! Even the highest costing Wolf 7.62x39mm is only around $0.20 a round, half the cost of '06. I DO have over 300 rounds of NC .30-06 because I plan on getting a Garand, but that is a totally different story...
The SVT-40... how does that suck? I can see how some people would not like the folder on the Yugo, but the '40 is dang near perfect. Over a pound lighter than the 91/30, easy to clean (as long as you aren't a 14 year old Soviet soldier using corrosive), awesome looking, no recoil, accurate, and if you have any reliability problems just adjust the gas system. If you don't have a tool, dissasemble the gas system and pop the gas adjuster out, then put it back in on the setting you want. Easy to do.
As far as the 54 area goes... a Romanian built PSL, a 1941 SVT-40, two M-38s (one unrefurbished), a Hungarian M-44 and a Tula Hex 91/30 fit the bill. I do not know why, but I really like the SVT-40.