I have some kenwoods for sale that I took out of my Octy , but they aren't
particularly bassy (though very nice sounding) so they may not be ideal if
you have no plans for a sub.

Which ones ?

I've bought some Pioneer Components that the Pioneer web site reckons
will fit the front, and some coaxl Pioneers for the rear.

May end up getting a sub or some 6x9's in a stealth shelf depending on
how it all sounds. Not keen on subs though.

Its a shame the standard ICE in the Octavia is so poor. Once you'd
changed the HU in a Leon it sounded pretty good, lots of bass as well.