Upgrading the sub first is a good idea. Even a modest upgrade such as the budget priced hsu and svs subs will provide better performance.
The Elac are honestly more of a side grade than an upgrade to the pioneers.
If imaging, accuracy, and extremely fast transient response is most important to you, I would strongly recommend The new Klipsch Reference Premier series. Unlike their
Fatiguingly bright predecessors, they measure quite accurate, and the 90x90 hybrid tractrix horn both projects a massive, highly focused sound stage, both on and off axis due to the well controlled dispersion, and provides good dynamic range and lighting fast transient response.
You could easily demo them at Best Buy and see if they offer what you’re looking for. Unless your room is huge, with a sub, you wouldn’t need towers and could save some money for the sub. Based on your choices in the OP, I’m assuming you’re looking at spending about $800-$1000. A pair of open box RP-150ms on eBay can be had for about $280 shipped, the RP 250c center for $230. In the interest of staying in budget, a pair of R-14ms for the surrounds would pair nicely, and can be had for about $120 on eBay. That leaves about $400 for the sub. Save a bit longer and you could get a VTF 2 or a PB 1000. If you’re not wanting to stick to a budget sub, you could also look at a Dayton Sub 1500 (if you can deal with the big size). It offers much better extension and a ton more output. I get 23hz -3dB in room, and can achieve 105dB from 23hz-40hz and 110dB from 50hz-100hz in my 20’x12’ room at a distance of 3m.
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