The south and east are pretty safe bets, not a lot of dud neighborhoods. Everyone talks about how nice Highlands Ranch is, esp. for schools, but you'll pay more for that neighborhood. I go to church in Lakewood and the eastern half of that town can be patchy, FWIW.
2009.5 PBM red/onyx M6 #1576/1829
Mods:SHOW-Atari gauges, CTS-V wheels (GXP spare c kit), GM locking lug nuts, clear front corner markers, red/onyx shift knob, VG Sharkfin. GO: skip shift elim, Roto-Fab. Exhaust soon, I hope.
1997 Grand Prix GTP - traded after 215k mi.
1987 Regal T-Type
2013 Suburban Z71