Subwoofer plus end stage/monoblock searched!!

hoi… i’m currently looking for a new subwoofer. wanted to go first on 2x30s in a BR housing and then connect it to my RF Power t4004. now i’ve been thinking about whether i’d rather buy a new front and rear system and that hang on to my RF T4004. TO THE OWNLY APPROACH: but then i still need a new subwoofer and a matching final stage. preferably monoblock. TO SUBWOOFER: i’m looking for a virtually allrounder. my bass should be vulominous, hard, a TO MUSIC: I often hear house black and sometimes still techno.. but sometimes I am also on nem charts, rock or hiphop trip. as you can see it should be an allrounder with power. I have a 30s in nem bassreflex housing in visier, but I’m not a specialist and therefore I know if this is the best solution. car is an A3 bj.2002 price should play from 500-750€ (you can also suggest cheaper?? or more expensive combinations, maybe take a look at it. h also something like that ) mfg and thank you chris