Help me choose an amp for components

I am planning a system for my 2003 Mustang vert. I am so confused on amps that it's driving me nuts.

Here's what I want to do:

Eclipse HU (probably the CD8454)
Focal 165W (already have these)
2 Focal 5WS (either in the back or in the front leg area - I have these)
Sub if necessary (probably a 10-12" JL W6)

I'm going for sound quality.

I would like to do a US Amps TU-4360 tube amp (4 channel) which would give me 75 wpc into 4 ohms (90 into 2 ohms) for the Focals. Is this enough? Are they 2 or 4 ohm?

I would then do a JL Audio 500/1 for a sub if I needed it.

So, is 75 wpc enough? I am open to considering other amps.

Your advice is appreciated.

Thanks!!