Wow! that really is a steal.

If I were looking to upgrade, I might go for some dual pivot brakes and aero brake levers. These can often be found on ebay for a few dollars and you can get a nice brand new set of levers, cables and brakes for $40. I always feel more secure riding with modern brakes and like the cleaner look better too.

If you want bar end shifters, you can order shifter pods that will allow you to move your current shifters up to the bar ends, plus you will need new cables and down tube cable stops. Assuming you do the work yourself, this will probably be about a $40 job. Personally, I wouldn't bother. I have both bar ends and dt shifters and don't thin the bar ends are much better, but YMMV.

If you have a bike co-op in your area, you will find no shortage of triple MTB cranks and long cage derailers to upgrade with. I have a 6 speed Deore drivetrain on one of my bikes and it shifts like a dream.

Keep us updated with lots of pictures!