by "run", i figure you mean 'has enough preout channels to send signals to amps to provide...'.
you are wanting 8 channels, each with suitable xover settings. i don't believe there's a HU out there that suits.
as you're thinking, a good option would be a processor. alpine offer excellent value processors which will cater for your needs. something like the PXA-H701 provides 8 channels of outputs, with adjustable xovers on all. and indeed, you could simply use a cheap Ai-NET HU with one, as you will rely on the 'RUX' remote control face to make all the adjustments, and simply rely on the HU for control of volume/balance/fader/sublevel adjustment (which actually take place inside the processor, with the HU merely acting as a remote preamp).
to reap the full benefit of the processor, you will want a digital input, in which case you need a high-end alpine HU with a digital output; so it's a lot of money to spend on a HU merely for the digital output but hey, some of us do it.

mind you, the audible difference between the analogue Ai-NET audio connection and digital is NEGLIGIBLE, so i wouldn't sweat over it.