I agree with sherblock, on the TT or something comparable even if there is speculation around here that there is nothing worth comparing. Especially for what sounds like your first bike. For the same price in the end the stock Kilo would still be nicer than the upgraded wal-mart. And to be honest it sounds like you've spent $130 on routine maintenance work.

If you're talking about having to do work as soon as you buy a bike why buy new in the first place? The hubs are not worth $100 as you say either. Nor is anything else on the bike. There are plenty of options for less to the same price range, and include better quality. A vintage conversion is a better option imo. An older bike with a reputable name at or around the same price will still have been better engineered and have better components than the wal-mart, slap 'em together, make a quick buck single speed will. Plus you get the wrench time you talk about and can spend the same amount of money doing upgrades to something you might want to keep. Not to put you down but man...

My advice is now that you have it, ride it around a bit but don't throw money into it. Save it, learn a little more about what you want in a bicycle, and find something better.