I never used Virwox though, I've heard their fees are quite steep. But if you want to go paypal -> bitcoin with a middle link, it might be an option..
Yeah i have used Virwox.com but the fees are enormous for Personal accounts. Probably CryptoSea.com have some business account registered with Virwox so they are avoiding the fees.
For Cryptosea you may take some better price through this link:
http://cryptosea.com/index.php?code=CrypZWT
The price depends from the amount you are exchanging - bigger amount means better price.
And i would not go with Virwox. Virwox is killing with their fees from the beginning.
I looked into Virwox myself as I am familiar with Second Life and Linden dollars but the conversions fees are worse than a payday loan place!