What cheap Amp+DSP combos are worth buying?

I'll be getting an i30N soon, and the audio system in it is very mediocre.

From doing a bit of reading around, upgrading the speakers alone doesn't fix it, and an amp makes it louder, but not exactly better. Adding a DSP (or rather, amp+dsp combo) is apparently the go-to solution.

One of the most common upgrade kits uses a Pioneer DEQ-S1000A2, but I'm looking for alternatives to it.

I'm not looking to spend a fortune on it, the mentioned upgrade kit (all 6 speakers + ampdsp, no sub) costs like 550 USD.

So - are there any other affordable Amp+DSP combos that would make sense to use in a similar upgrade? Ideally ones with some sort of auto-tune capability, even if very basic.