What to buy?


Hi: I'm looking for a good pair of floor standing speakers but I don't know anything and I'm hoping for suggestions here.  I've been considering Martin Logan Electromotion, Goldenear Triton 3+ and Revel F35. I can raise about $2,000 in a month. The room is 20 x 20, the music is mostly rock. The amp is an Emotiva XPR5 which has respectable power. I don't mind something good that's maybe been superseded, trailing edge, a floor model or demo - but something you can't argue with at the price.

Thanks - rev
revnice
I've listened and compared the KEF LS50 (which has numerous very  favorable reviews,,,and sales...) to the KEF R700 and to my untrained ears they sounded very similar with the exception of more bass for the R700.  I'm guessing the R500 is cut from the same sonic cloth.  Maybe a used R700?
The R700 might go 1 or 2 Hz deeper-that’s. it. Not worth a 33% increase. Everything else exactly the same.
Save a little longer and get Klipsch Cornwalls. Add subwoofers down the line and you'll easily hit 115 dB and have the remarkable detail and dispersion of horns. For medium powered amplifiers there is no better speaker for a rock and roller. 
If you aren't the tweaky audiophile type who values space and imaging above all you might look at Klipsch.  They are really fun speakers and can dig out something good with even the junkiest of recordings.  I have the Forte III and in many ways enjoy them just as much as my Kef Blade 2