Hi, B. -- welcome (soon!) to Plano! I moved here from California 10 years ago. What a change! I went from city life in San Francisco to total suburbia. Wow, is it ever flat out here! :-)
I have to put in a strong pitch for central Plano. Most city events take place here (parades, fireworks, lots of events at the Plano Centre, etc.) You can reach either end (west or east) in 15 minutes. That includes the Tollway or 75 to reach Dallas, etc.
Plano has many parks, walking trails, and several rec centers with pools and lots of classes.
The schools throughout Plano are wonderful. I have 6 kids and at one point we had kids in each zone, central (my kids), west (my stepkids) and east (my son in the IB program). The west end is definately upscale with multi-million dollar homes and it is not unusual to find Lexuses and Hummers in the student parking lot. Central is more middle class with a cross section of cultures. The east, while noted by others as the "older/ poorer side of town" hosts the most academically challenging educational IB program (college level courses).
In addition to checking the school sites for their performance levels, be sure to check the physical school zones. The central feeder schools are in a very narrow band across Plano. This had quite an impact when we decided where to buy a home. (The high school we thought was closest to our home actually feeds to the east side and that senior high school is 15 minutes away.)
Something to watch out for when purchasing a home -- foundation trouble! I was not prepared for this coming from CA. This part of TX has soil that dries out so severely that it can shift the foundation causing cracks inside and out. Expensive to repair!
Plano seems to have everything I need - and if I can't find it here, or just need a change, I go to Frisco (which I call Mallville :-). They're STILL building malls around the main mall! If you can't find it there, they don't make it!
Good luck with your decision!