You are already looking in the best neighborhoods closest to your employment in Irving, Valley Ranch and Las Colinas.
Not sure of your budget, but you might look at Grapevine for reasonably priced housing. The commute would not be bad to Irving, but you would have to drive. Denton County also has the "A train" which runs from UNT down to where the Green line of the DART light rail trains terminate in Lewisville. Denton County opted out of the DART mass transit system early on, and now is trying to catch up on it's own.
In terms of mass transit from Uptown to Irving, DART just opened up the Orange line light rail. These trains run from downtown to Las Colinas (Irving Convention Center, roughly Northwest Highway and 114). The Orange line will open up additional stations across Irving and eventually terminate at D/FW airport, by 2014. Check out the DART system maps at dart.org, and they have a mildly useful trip planner which will give you options (light rail, bus, and the TRE (Amtrak type passenger train that runs from Dallas to Fort Worth)) point to point.
PM me for more suggestions... Good luck!