Since the pano roof is for the facelift models 2004 and newer your going to run into problems bolting that in I would imagine.

Motor wise any bmw motor that works with the v8 transmission that is in there now will work. Changing to something that isn't bmw motor wise will be a nightmare because of the awd.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
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Aftermarket E53 Radio Install