If the phone features matter to you, it's also worth mentioning that the original N-gage is tri-band GSM, meaning it'll work in the US and in Europe (and perhaps Asia.) The QD has different regional band support depending on what region you buy it in.
There is a port of Quake for Symbian too, unfortunately no new versions have been released since end of 2006. To have Quake on the phone is great http://nwitech.homeip.net/products The best games in my opinion: Pathway to glory games, Ashen, One, Worms, Asphalt and Rifts.
1) Pandemonium is a good conversion; it's as good as the PSX version. 2) Crash Nitro Kart reminds me a lot of Super Mario Kart 64. 3) Virtual Tennis is a good time killer. It's not *too* far off, compared to the PSP version. 4) Stuntcar Extreme. Although I prefer the Tapwave version. It's still available from http://www.clickgamer.com/moreinfo.htm?pid=5197§ion=S60 And... 5) Puyo Puyo is always a lot of fun. The PSX versionf of Pandemonium was the first 3D game that really 'struck' me. The depth and scale, that is portrayed in the game, is amazing; it's 3D done right. It's a quality system for portable games. It's definately a hidden portable gem, similar to the Gizmondo and Tapwave.