Will these sound better than my current HTIB speakers?

[Gavica]

I have this setup in my bedroom:

http://www.sonystyle.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&langId=-1&XID=O:ht-ddw900:dg_ggldf&productId=11033329

I was thinking of eventually upgrading all the speakers and subwoofer.

But I thought about starting with the FL and FR speakrs, Im on a budget.
So I was thinking of buying this ones and eventually get even better Front speakers and send this ones as surround.

So u think this speakers will give me better audio? Are they better than what came with my HTIB?

http://www.amazon.com/Sony-SS-B1000-Bookshelf-Speakers-Pair/dp/B000OG88KY/ref=pd_bbs_2?ie=UTF8&s=electronics&qid=1235347364&sr=8-2

[Mr Peabody]

In one aspect they might because the 5.25" driver will give a more full sound by playing lower than the 3 or 4" driver in the current HTIB but on the other hand all the speakers you have now are voice matched for a consistent and seamless sound stage. But if Sony offers a center speaker to match the ones you want to buy and you will get it eventually, go for it.