Mark
If you ever get a chance. Try out a 1 series body from Canon - it's a totally different animal. Even though they are beasts to carry, they are amazing and fun. I'm really tempted to trade my 1D Mk II for a Mk III - the higher ISO and lens focus tweaking being the main features.
I too have a lot of money into lenses, but I have trimmed my collection a lot. I'm still kicking myself for selling my 200mm 1.8. The price has gone up $1000 since I sold it. The lenses on my wishlist now are the 50mm 1.0 and 85mm 1.2.
On a side note - I do like the sound of the Nikon shutter. It's very quiet.
This software is my favorite for processing RAW images
http://www.photo-freeware.net/raw-shooter-essentials.phpAdobe bought Pixmantec and turned the software into Adobe Lightroom - which is decent, but I don't like it as much. RAW Shooter has amazing noise reduction and sharpening processing.
Take care...