That size would be great for a RussianJust make sure the heat lamp is also a UV lamp! The best one on the market right now is the ZooMed Powersun, 100W.
If you're looking to buy a captive bred hatchling, I got mine here: http://ivorytortoise.com/ These guys are great, have a wonderful reputation and take good care of their tortoises.
If you need more info, check here: http://russiantortoise.net/index.htm It has the best care info for Russians I've seen anywhere, plus there is a link to an active forum if you have other questions that aren't answered there.
I noticed you said "Russians" in your post - not sure if you meant you would want to get more than one, but if so I can tell you that Russian tortoises are a lot like BPs - not very social and don't usually do well living together, with some rare exceptions. Just so you know!
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