As mentioned, the best thing to do is buy the Deathwatch bitz pack (it really is a nice pack, well worth the extra money) and either a Command Squad or a Tactical Squad box.
There are numerous bitz services where you can get any extra bitz you need (Heavy Bolter & backpack, for example). Check out BitzBarn, Bitsandkits.co.uk, & Bitzbox.co.uk - all much cheaper than BW Bitz.
The best thing to do, if you want the PCs to be able to change/upgrade their weaponry, is to order a couple round neodynium/ "rare earth" magnets, cut all the hands off, drill out each wrist/hand combination, and then arm appropriately.
Storm Wardens are the Highland Scots of the Space Marine world. When they become Astartes, Storm Wardens generally fashion an appropriate-sized claymore sword for themselves. So, yes, the Emperor's Champion sword would be perfect.MagickalMemories wrote:I don't play the 40K RPG's. How big do they say a claymore is?