REL Vs SVS for 2 channel music listening

I've owned several SVS subs and think they are great for home theater. I wouldn't choose them for 2-channel. I prefer JL Audio. To my ears the JL Audio subs produce musical bass. 

I just put a JL E112 in with my new Vivid 1.5 speakers. I have them turned way down so you don't "hear" them, you just know that they are there. Very satisfied. I considered REL as well. Felt that the SVS was more of a home theater sub.

I also use the Zu Audio Omen Defs, I bought a SVS subwoofer a couple years ago a PB1000, on sale and a super low price. I had difficulty getting it to blend with the Zu speakers. I email SVS and receive a quick reply from the president of the company. Gary Yacoubian. He gave me his phone number and I gave him a call. I told him of my problem and he suggested I talk to the main engineer, so he patched me through to him.  After he listen to me describe my problem he gave me a few suggestions, after I implemented his suggestions I got the SVS dialed in for my two channel music. I thought that is real customer service.

Great! What kind of tips did they give you?

I'm with @contuzzi @ricred1 @crwindy on the JL Audio. More musical.

But likely out of the OP's stated budget unless he/she can score a great deal used.

+1 regarding @crwindy 's post. Less is more. 

Since you seem to be leaning SVS, I second @yogiboy  's recommendation to go with the discontinued SB12 for $400. I'd double up. If you are going with one sub, then the Outlet PB-12Plus in Piano Gloss (with no damage) for $999 is another option.