I would be put off from buying on eBay if the seller did not offer PayPal (or asked me pay in a different way). I only ever pay via PayPal or in cash upon collection of the item.
If the seller says he is not okay with using PayPal then I will just find another auction.
Dave, I think you should offer a delivery option (obviously you'll need to have an estimate P&P budget. It doesn't need to be exactly correct, but it should be fair).
Most important thing however is that your item description is accurate and well detailed. Auctions with a few clear photos and a decent item description will sell well. Because of the excellent condition of your item, it will be unlikely that someone will bid at random on your auction because that person is generally after a cheap bargain! As your BeoSound 1 is so new, in excellent condition and comes with a few extras too, I think your future buyer will have recently made the decision he/she is after a BeoSound 1 and will be looking around eBay for a while to see what comes up. Therefore, put your listing up for the longest period of time (10 days - there is no extra fee for this) to maximise the amount of views your auction receives.
Hope this helps.