Good 6 or 8 Channel DSP amp for not too much $$$? JBL4086?

I’m looking to add an amp to my 1986 Mercedes 560SEC. The car has 4x6s up front, extra tweeters in the doors, 6”s in the rear, and two extra subs on the rear deck. I’m seeing the JBL4086 out there for $300, but I’m not sure I need DSP or if that’s the right one to go for. I can also drive the subs via a different amp if needed. Are there any other options in the $250-450 range that are good? I’m really not looking for insane power at all, just a healthy upgrade over stock. New or lightly used that I can find on eBay or DIYMa would be awesome.