Personally, I think at this point your best option is probably to save your money for a few months and look to buy an HTiB or cobble together a receiver and some speakers used through Craigslist/eBay. I cannot surf craigslist at work, but I'm sure for a few hundred dollars you could get yourself a serviceable 2.0 or 2.1 set up with a receiver that will sound infinitely better than purchasing any one of the adapters that we found so you can hook up a couple of speakers with a 3.5mm jack.