Fees you are charged are based on an initial listing (i.e. insertion) fee as well as a fee based on closing auction price.
A higher initial bid price will cause you to have a higher insertion fee. If you are confident the item you are listing will get good bids and traffic, use a very low initial bid price to minimize your insertion fee.
Using the Buy it Now (BIN) option has usually worked out good for me. There is a small extra fee but you usually sell items faster and there are some people willing to pay a premium price to just BIN rather than wait for an auction to close. If you use BIN, I would set the BIN price to just a little higher than what you think the item would go for if it went for a full auction. Research completed items of a similiar description to the item you are selling to determine a good price that the item is worth.
There isn't much you can do about final value fees. It is usually some percentage of the final value. Read more about the fee structure here:
http://pages.ebay.com/help/account/fees.html
Some people use Reserve prices to ensure that the item they are selling does not go for an unreasonably low price. This is not usually a problem with computer hardware so I would not worry about using a Reservce price. Besides, you can always enlist someone from SF to put in a bid that is slightly less than the min. amount you would take for the item. That way, if nobody else bids on it, you won't make the SFer buy it and all you have lost is your eBay fees.
I usually list stuff on Sunday evenings for 7 days as it seems eBay gets lots of traffic on Sunday nights.
Make sure you accept PayPal. It is the most popular online payment method on eBay that I know of. I think you are a big disadvantage to other sellers if you don't use it.
C