I know you asked for a 2x10" cab, but you have the option of Eden's EX-110 (1x10" @ 4Ohm) or EX-112 (1x12" @ 4Ohm), both can handle 300 watts.
Another option is the Hartke HyDrive 112, it's a 1x12" cab that you can switch from 4 to 8 Ohm and it can handle 300 watts.
I hope this helps!
