Surreal Boredom: My advise to you is to buy, only when the need for a particular type of knife should arise.
Problem is how would one define NEED???!
Believe me, years later and a closet full of unloved and untouched edges...
There isn't a day past where I don't question the 'wisdom' of past purchases.
Remember most knives actually last more than a lifetime; what dead weight!
Everyone should however, try to own several blades of different length and sizes for actual use.
In this way, you would have a knife fit "for every season" ;-)
For fixed blades, one each of everything from 4 inches to a full length bolo is ideal.
And don't forget about having a slim filet knife and more importantly a wide skinning knife.
Plier tools and SAK's goes without saying.
As for daggers, it is not a toy, PERIOD.
If you are in 'that branch' of government, rest assured one would be provided.
But you know what!?, I guess it would be kind of cool to add a Desert Dagger to your collection anyways.
Which brings us the question, "Would you see yourself having to use one any day soon?".
Perhaps your current requirement favours a less specialized form of blade.
One that you can be readily put to good use, without the constant fear of strange folks asking to have a closer look at your 'Kill Bill' knife ;-)
If you NEED to buy, you can't go wrong with an AGENT.
Besides, it sounds cooler!
BTW z17813: Its news everywhere.
Aussie SAS Recruitment Drive
http://212.58.226.18/1/hi/world/asia-pacific/3206490.stm
Good luck in the selections whoever you are!
http://www.defence.gov.au/news/armynews/editions/1085/topstories/story01.htm
Article: Vet's 12 yrs experience in the Aus. SAS
http://www.mfat.co.uk/uksf.php?page=uksf7
Krizzard, out
"...Whoever kills with the sword must be killed by the sword... "
- The New Testament, Revelation 13:10