I wouldn't necessarily assume that just because it's easier to get low end response for a low price point using a port that using a port is necessarily a fatal compromise. I would say it's clearly not given that many speakers that don't need to compromise due to their price point still use them. but probably anything you get in that $500 range is going to have pretty significant limitations whatever the design.
Focal Twin6 Be monitors are non-ported nearfields and are very widely used, though pretty pricey. They use a pair of 6" drivers with both handling the lows and only one handling the lower mids, to get a good low end response without a port or larger cones, but also not muddying up the lower mids supposedly without having to go with a three way design.
Speakers I think will always remain pricey for the good stuff, because they are mechanical devices so they don't keep getting twice as good for half the price like electronics. I imagine that computer based simulation and such has made a big difference in the last decade or so, but fundamentally they still have the same issues and dealing with them really well will probably continue to be pretty costly.
Anyhoo, I wouldn't want to give up the ability to hear the low end over worries about the port making it less than uber-perfect. If you can't hear them, it's hard to really judge the balance because you are hearing all the highs but not all of the lows.
The Mackie HR824mkII speakers are not ported, and they use an 8" woofer plus a sort of passive radiator on the back (though still sealed I think?) to get the low end response. They are about $700 apiece. I had a pair of these, and though the high enders will probably turn their noses up at them, they have pretty good performance and are large for nearfields as well which helps.