Correct Amp for Component Set

[05AztecRed]

So I'm finishing my stereo setup in my Nissan King Cab truck and I need some advice on which amp to get for my speakers. I'ts going to be a Phoenix Gold, so it will match my amp powering the subs.

I have an Alpine SPR-136A component set. 40WRMS max at 4-Ohm. I was thinking the PG R2.5:2, which is 2-80WRMS @ 4-Ohms, and 2-75WRMS @ 2-ohms.

I'm thinking this amp will work for my setup if I only use the component set.

I have another set of Infinity 6X9s rated at 125W RMS @ 4-Ohm. If I wanted to add these later, would I still be able to use this amp?

I know there are other component sets out there, but this is the one I'm going to stick with.

[BOOKER]

If you don't have the amp already, I will say to get a smaller one no more than 50 watts, most in here will say to go for it and set your gains accordingly.

I don't believe on overpowering speakers , but that is just me.

If you already have it, definately you can use it and adjust the gains there's nothing wrong with that, but IMO that's a waste.