NPB's are the least of worries, usually. File the report, relist your item. I'll generally state in the relisting that I had an NPB if I'm selling something somewhat rare/unique, so people don't think I'm scamming and/or getting items returned.
Watagump found the bigger issues. 1) Paypal holds and 2) Bidders outside continental US.
I'm not sure what the technical ruling is if you list an item and a bidder violates the terms you set in the description simply because you didn't make sure that they couldn't. I think not listing international shipping and writing 'continental US only' or even 'others please contact before bidding' or something is good enough to tell someone to piss off, but knowing eBay they'd probably side with the buyer in such a dispute ('but it let me click the button! I have to read?!').
I would assume non/late-paying bidders are subject to what's laid out in your ad (payment within 24 hours, 10 days, anywhere inbetween...). IIRC there is no field for 'payment due...' other than requiring instant BIN payment. But there is a standard listed somewhere in their FAQ/help stuff. That is one good I will say about eBay- at least they lay stuff out pretty clearly. I don't know if I've ever had question about buyer or seller protocalls that wasn't clearly answered somewhere. The bad part is that I'm pretty sure said literature says you must wait 'x' number of days, then file a report, then wait more days. Then you get an official 'judgement' if the buyer is AWOL. You can always relist before this, though.
My biggest issue was sending a turntable to a guy in Hawaii. I usually wouldn't ever ship there, but it was pricey and he did contact in advance. Then he got the item, told eBay it was broken, filed a dispute, and eBay told him to ship the item back. That, and they placed a 'hold' on like $500 in my Paypal account...even though I didn't have any money in my Paypal account. So they crippled my selling by 'overdrawing' me, causing any incoming funds to just go against the negative total. All of this before I ever even had a chance to get involved.
I contacted eBay and told them what the hell was up. A) I spent $100 to ship this guy the turntable in a ridiculous box with enough padding to survive the apocalypse, B) I have videos of the table running in my auction, and C) the item was insured through the USPS; insurance which they have voided by putting the item on a return trip without my permission.
That last bit hit their 'oh shit we done fucked up' button, and left them with no choice but to refund the guy's money AND release the hold on my Paypal account. So in the end, I got paid. And I sold the item again (despite his best efforts to pack it like shit, it still worked when it arrived back at my door. albeit with the cart stolen off of it).