Solaceon (Zui), Eterna (Hakutai), Kurogane (Oreburgh), Celestic (Kannagi) and Tobari (Veilstone)
I like Lake Valour too
Solaceon - great place to live. It's got the breeding center, and lots of local berry patches. It'd be even cooler, if the Unown cave went from it to Tobari.
Kurogane - I like the song (happy) and the graphics are very impresive
Eterna - reasons stated above, plus Natane has the game's coolest gym. I never thought I'd be able to walk through a forest like that.
Celestic - just for being so quiet, rural, having a Japanese style house and having pretty surroundings.
Tobari - mainly because of the song and because [spoil]Shinji's from there[/spoil]. Also, that city has a great store.