I came to the conclusion a while back that there are no perfect mixers out there in Eurorack.
I'm ending up with a hotch-potch of mixers to do the job, but this approach does work as you work on Sub-mixing before hitting a mixer you spent a bit more money on for the main outs.
You can get very well featured outboard mixers second hand on ebay etc for a fraction of the price of Eurorack that you would take up a full row of rack space, though I guess if you are doing a lot of Send-and-returns then you will end up filling rack space with modules to do that for the outboard gear.
Its a tough choice.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.