In the new/unused category, the Stax 3030 form audiocubes is close to budget, and IMNSHO is PFG. A great foundation, and a very good value, factoring in the cost of a good driver for comparable dynamic cans. Be prepared for a long burnin time, if your belief systems support burnin/breakin. Once dialed in, I found it to be most chameleon like *and* very low fatigue.
To my ears/brain, there is a certain, hard to word, magic for lack of better words that for all their faults, electrostaics in general have...like jazz music, it is felt more than heard. Maybe it's genetics? Some of us have a preference built in?
A while back I did the permutations of a 3030 and 4040 system: 303 & 404 hps with the 313 and 006t drivers. Ended up with both systems! Have not auditioned the Omega system, don't wanna know, these are more than adequate at the pricepoint. That is my current threshold for diminishing returns...
The 4040 has more of that hard to describe magic, but I could live quite happily with the 3030. I know this seems simplistic, but differences were about evenly split, ie the 303 with the 006t driver and the 404 with the 313 driver were about equal and half way between the 303 with the 313 and the 404 with the 006t. The 313 driver was a bit more tolerant of power, as it was relatively less improved when fed AC from a PS P600 compared from straight out of the wall. But, the 006t driver with two inputs, one with XLR/balanced as an option, is more convenient than fumbling around the back with more than one souce. Stayed with single ended input(s) for comparisons.
As to perceived bass, both systems (actually 4 permutations) are not bloated, with I believe the 006t having less "impact" if not fed clean, tight AC. But, the opening heartbeats of Dark Side of the Moon had more extension and slam than most speakers I've heard.
Everytime I thought I was hearing too much top end, sizzle, tizz, brightness, it turned out to be something upstream. Conversely, murkyness, lack of low level resolution *always* was something upstream. Although they "should'nt", cables made a major difference: I settled with Stealth M-7 for single ended, CWS or PGS for balanced.
Sources used were modded Philips CD-80, modded SF T3/P3, and stock Denon DPS1/DAS1.
How to reconcile differing perceptions? You may be as happy, or happier with an AT W100 or W11, or a Senn 600. Anywhere you can get a listen under relaxed conditions?
cheerio...
WMS