Having it be a "one shot deal" is a bit of a bummer as you don't have the luxury of buying the "core" equipment now and adding more gear a bit later once you have a better idea of what you need. Considering the amount of gear you are looking to get you definitely should make sure you focus on what you need, and only look at what you want if there's any money left over.
Just off the top of my head here is my 2 cents about stuff in the "need" category
For post:
Mac Pro 2.66
4gig RAM (don't buy RAM from Apple)
250gig HDD for a boot drive
1TB external storage for media (just ball parking here).
X1900 video card (upgrade via Apple)
2x 23" Apple Cinema Display
Matrox MXO (this will allow you to use one of your 23" ACDs as a decent-on-a-budget HD monitor as well as giving you b'cast quality HD and SD outputs)
Blackmagic Intensity Pro (cheaper-but-not-as-good alternative to the MXO that may or may not meet your needs. You can't plug it into an ACD so you'd drop one of your Apple monitors and add an HDTV))
Deck - What format(s) would you need to deliver on so your stuff can be broadcast?
Speakers - A decent pair of powered audio monitors (not computer speakers)
Surge protector or two
Production:
Camera - I know the EBU is pushing for progressive formats (720p or 1080p) does that matter to you?
Tripod - good, fluid head tripod
Camera bag, extra batteries, filters, etc.,
Audio - A lapel mic that can work both wirelessly and wired.
Lighting - can't offer specifics I just know you'll need it.
Nothing against the helpful members here at MR, but you might be better servered hitting up an industry site like
The Creative Cow or
DVinfo.net and getting advice from guys who may be in a similar situation to yours especially since you only have one shot to get the gear you need.
Lethal