Quiznos is not at APA, atleast not to my knowledge. Xjet seems to be adding aircraft on a daily basis...now I don't necessarily think that it's hard to get in their, but its more like they are so busy they don't have the time to interview. A persistant pilot might just land a good gig over there. A lot of their aircraft did come with crews...more like the plane moved from it's previous location to Xjet, so I really don't have any idea what they might be looking for.
As for other operators, they are actually a few of them there, just not any looking to my knowledge. Airmax use to be based near us, they seem to be growing or promoting guys and looking for pilots from time to time. I know they pay well and have good equipment and moved into their own hangar...no idea if they are looking now.
It's a pretty tight knit group here...I wish I could be more help. PM me, and we can chat a little.