Hi,
I have a number of them, and I haven't found the perfect one yet. I'm trying to put a custom font together with the most suitable instruments out of each.
Actually not all that difficult using the Librarian program http://www.synthzone.com/ubbs/Forum43/HTML/000023.html
I have the following

SGM180 (180mb) [url=freehttp://www.geocities.jp/shansoundfont/][url=freehttp://www.geocities.jp/shansoundfont/][url=freehttp://www.geocities.jp/shansoundfont/]freehttp://www.geocities.jp/shansoundfont/[/url][/url][/url]

SGM128 (120mb) free http://www.sf2midi.com/index.php?searchword=sgm128&filetype=sf2&typesearch=files&page=search&submitButtonName=Go%21+%3E%3E
Another gs/xg ( free) Not sure if still available.

Papelmedia http://www.papelmedia.de/english/index.htm

Reason Provitamin http://www.reasonbanks.com/pvitamin.html
Synergi http://www.samplebanks.com/

Sonic Implants http://www.sonivoxmi.com/ProductList.asp?next=86&lstShipCode=D

There's certain instruments I like in each.

If you need xg drum mapping
Provitamin appears to have it even though it's a gm font. Check drum map on site.

Synergi also has xg drums, but not one of my favourite fonts.

If you have the ram to load them , I'd be more inclined to get sgm180 or 128 and try them first.

Provitamin & Papelmedia are approx 200mb's each

Sonic Implant is only 24mb's though quite good. It is rather pricey though.

best wishes
rikki