I would consider these.
Knukonceptz product detail for KRYSTAL KABLE 4 CHANNEL 6M TWISTED PAIR RCA CABLE
I love my set. For 75 w the 16 gauge should be good.
Are you going for SQ?
I'm not especially going for SQ, but I do have Focals so I do want them to be able to shine. But the amp I have is really not a SQ amp (but hey, it was free and it's brand new) so I'm not going TOOO big into SQ at the moment. But I do want to get good cables so that when/if I do get a nicer 4 channel the cables wont be holding back anything from the rest of the system.
If you plan to do a SQ setup later... this
Knukonceptz product detail for KARMA SS 12 GAUGE SPEAKER WIRE
I just placed an order for those yesterday. A lot of people will tell you it's not necessary but I do it anyway.
I know it will up the cost of the build but I am always paranoid about signal loss...
Also don't forget the speaker terminals: KnuKonceptz - view products for category Installation Accessories
fyi op you dont need an sq amp to have an sq system. you can always install a processor or an eq to fix the sound quality problems in your car...
KNU makes great products. I use them nearly exclusively.
If you are a little crazy like I am... I even buy the subwoofer rca's instead of the regular ones for my bass amp... I don't know why they aren't easier to find on their page, I have to use the search bar to find them: