I need to install a 60amp sub panel. I will be running the feeder cable in Schedule 80 PVC. The run is 100 feet long, I want to use 2 gauge SE Quadruplex type RHW-2. Is this cable OK or should I be looking at something else. I want to be able to use it for 100 amps in the future.

The wire size and insulation type is fine, except I believe this cable is 4 wires twisted, which may be difficult to pull through conduit, esp elbows. Depends on the size conduit used. You may want to use at least 2 " conduit, or use individual wires with XHHW or THHN/THWN insulation, which will pull easier.