Hey, need some advice on PayPal.

I just sold some stuff on Ebay for around $700 US. Amazing what women will pay for Prada.

My question is, if they PayPal it over immediately and I use the money to pick up something from Ebay will I be protected in case they sent over fraudulent funds? I went to PayPalSucks.com and they had stories where PayPal would freeze accounts or charge the seller again if the buyer did not pay with "clean" money.

The buyers appear to have good feedback, 60 and 250 feedback w/100% and are active of late but i'm still cautious after PayPal tried to scam me $250.

Thanks.

edit: (cliffnotes) I don't want to send the item out and then find out the funds the buyer paid with are fraudulent. Is there a way to ensure funds are 100% legit?