Thinking of getting these from Eliseparts

Was thinking of just changing the fronts, £288 inc vat, or am I best to change the rears as well, £485 for full set.
Probably stick with the Pagid RS42 pads and chucking on some braided hoses as well. £70 inc vat also from Eliseparts.

Anyone used this combination before or reccommend superior alternative?
Oh and what brake fluid would be best for some hard braking on track?