why 2 ohm fronts? and the fiber optic is not an issue... its only an antenna fiber optic line thats it. everything else is just reg awg wire. and any decent audio shop not best buy will have it. also I would stick with 4 ohm the reason is its not to good to start adding different aftermarket speakers to a factory system with different impedances'. will throw off staging very badly. I'd say look into a set of decent components up front and a set of alright coax in the back. look for decent small speakers for the dash look for something with a very smooth tweeter setup because after market speakers will outperform your factory system and bright tweeters aimed at your head = headaces. and how do you plan on hooking up the amp/amps to the factory hu? 400 dollars for severl speakers and a sub isn't much but It can be done. how many speakers in what sizes do you want. Imp aside. and what kind of sized sub do you want.? I'd say a single Re audio se 12 in a ported box tuned to about 32 htz will make it a great sounding ride.