Hmm first of all...
i think it is possible that you save a few hundred bucks... that audio card is deemed unneccesary to me since your P4PE already has an onboard audio card :X, thats if im correct that it has
also, about ur graphics card, u can buy from another maker, either from asus, ati or anywhere else, and u will be able to save AT LEAST 200 dollars... trust me
hmm your processor, itd would be wise to switch to a 2.8b since after all... it doesnt cost any much more, around a few tens? mb 30?
Its still kinda messy, your webbie and if only u cud clear it up to show wad ure new com will have, coz frankly i dont care wad ur old com has