I've seen a few on this site. I'm not a big fan of aftermarket stereo in the x5. if you're going to do it, i'd say go double DIN navigation unit. Those look the best. single DIN just looks terrible. Search "double DIN" or "head unit" on the forums maybe. There are a few good double DIN units out there.

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2