Hey jheaddon i wouldnt mind helping but i dont really know which area i would be helpful in. Ill try and practise on creating new textures for now though :)
With normal retail all you get is HL2 and CS:S.
With retail Collectors Edition you also get HL:S
http://store.vugames.com/productmerch.asp?cookie%5Ftest=1&groupid=117
http://www.steampowered.com/forums/showthread.php?s=&threadid=148079
:)
Edit: If you get it through steam you...