We have a pretty good voting plugin (grab the mapchooser.smx from disabled dir in /addons/sourcemod/plugins/disabled/) and that seems to work out for us very well. DM Timer is good too because it forces the map to change for us. works well!

The best maps are ones that people give positive feedback on. Hang-em high is totally cool. We like to run regular maps, but a different version such as de_dust2_night. The FPS stays high, but people aren't bummed out that it's a regular map. cs_office_night_final really makes people comfortable with a stock map, but it's nighttime! Makes them feel like they're playing a new map. A new favorite for NS players has been de_inferno_fog. It's like 1.6 for source! People totally dig it and it's high FPS!

Otto