Ok, I missed the Bitcoin mining train.

Is there a way to use the ASIC for LTC, or stick with the GPU?
No, mate you need to do some reading. I mean this politely. You need to be able to differentiate between sha-265 and scrypt. Scrypt requires on board memory. It's far more memory intensive than sha-265, hence GPUs are capable of both. ASICs aren't, well aren't yet, and this recent hardware evolution is not capable of scrypt...