Seat Leon Cupra R (2003) install advice

[Rob]

Hi guys looking to upgrade from the factory setup in our LCR (mainly brought
about by a faulty changer)

looking for a good sounding all round system some bass would be nice but
boot space is at a premium as its a famliy car and still needs to take a
buggy and a weekly trip to tesco.

looking for a half decent head unit with a USB input (for loading off of a
usb memory stick)

already have a set of brand new boxed genesis p16's sitting here(any use ?)
that should have been used in my last serious install many moons ago

budgetwise i'm thinking around 600-650 although less would be good but more
is fine if its justifiable

love to hear your thoughts please guys

atm the install is factory spec (although i've got the harness and fascia
adaptors sitting here ready to go

my thoughts so far are

HU
Alpine iDA-X100

front doors

Genesis P16's
Alpine PDX-2.150

rear doors

stock speakers
HU amplitication

boot

Kicker DX300.2 Amplifier
Kicker VC124 Enclosed Subwoofer

one slight problem i have is i appear to have lost one of my original
genesis crossovers anyone know where i can get a pair of crossovers from
these days