I own a Sportkilt and think it sounds right for your needs, especially the Works model. The advantages over your other options are: sewn down pleats (vs. SWK Thrifty), buckles (vs. SWK Thrifty and USAkilts casual), fringed apron (vs. USAkilts casual), custom length (vs. SWK), velcro closure (vs. SWK Economy), belt loops (SWK Thrifty).

My lass feels that the addition of the fringe and buckles makes a knock-around kilt more presentable for wearing outside of sports, which is one of your requirements... to her, these features help to distinguish a kilt from a skirt.

The buckles and belt loops aren't necessary in terms of function because the velcro closure system is sturdy and adjustable. It's nice to hike up the side of mountain, wipe off the sweat, throw on a belt and sporran, then head to the pub looking sharp! That's exactly what I did in my Sportkilt this past summer on the Grouse Grind in Vancouver, BC.

That being said, a SWK Thrifty can't be beat for price...

Also, USAkilts is having a sale on their off-the-rack casuals right now: