A .30-30 doesn't need a 3-9x40, but it wouldn't be hampered much by one either. Personally, I'd probably go with a fixed 4X on a .30-30.

As far as brands go, well, I'msortofpartial to Zeiss and Leupoldmyself. A Leupold FX II 4x33 would be a nice fixed power scope. A VX II 2-7x33 should work if you want a variable.