Best Sub for Music under $900
I'm looking for sub recommendations to replace the Polk PSW505 in my nearfield 2.1 desktop setup. My speakers are the Gallo Strada II and I would like acquire a sub that can keep with them up it terms of speed and accuracy. Room volume is about 1200 ft^3 and is typically closed off. As noted in the title, my max budget is $900, but I would actually prefer to spend only around $600. My main considerations are sound quality and bang for buck value. I would like a sub that is punchy and has a nice mid/upper? bass thump, but I don't need something that rattles my 5h1t. In fact, I prefer to listen at low volumes since this less fatiguing when sitting next to the speakers and less disturbing to other people in the house, so, if possible, I'd like to have a sub that can produce a satisfying and palatable bass at "late night listening" volume. While the sub will be basically used for 100% music, I wouldn't be opposed to purchasing something capable of more output, in the case that I relocate to a larger room or decide to also use my setup for HT.
Originally, I was pretty much set on getting one of the outlet SB12-NSD since SVS seems to be universally recommended and has a stellar warranty, however it turns out that SVS charges tax in my state, bringing the price of the SB12-NSD up to that of the Rythmic LV12R, which is supposed to be "audiophile". Additionally, for $200 more, I can buy the PSA XS15se, which reportedly is good for music and comparable to more expensive SVS models. So, as of right now, I am officially confused since I have no idea how these subs compare strictly in terms of music performance or if there are other alternatives that I should be looking at.
Last option for me would be to DIY one of the higher end Rythmic direct servo models, if they really are that great for music that is, but I'm rather time constrained at the moment, so this will probably not happen unless there is a complete kit available that only requires a quick assembly. Considerations such as size or WAF aren't important, but I plan to put the sub against the wall, so a rear ported sub may be a problem.
Thanks in advance for advice/suggestions.