Sounds like a good plan. You never lnow though, your highs might turn out to sound awsome just being on the factory amp. Had mine ran that way for a little while, but I didn't have a fac amp, just ran the highs off the HU and had my subs. Didn't sound bad, but there is always a time for upgrades. Let me know how it turns out for you and if there is anything else that I may be able to help you with, let me know.