As some of you might know, I've been using this bike for a while now:

Forum link:
http://www.bikeforums.net/commuting/...l#post16350299
However, I'm looking to upgrade to a different bike, and I've been thinking about getting a fixie/single speed bike. I am not looking to spend very much money on it because I have no need for a high-end model etc.
Do any of you have experience with this bike for instance?
Amazon Link:
TRACK FIXED GEAR BIKE FIXIE SINGLE SPEED ROAD BIKE
Or others similar to this one. I will probably get a bullhorn style handlebar and brake levers closer to the neutral hand position down the road etc. Perhaps even a rack mounted on the back to have the option to carry things here and there.
This is the same bike as the above with some modifications that really caught my eye:

(Picture from the Amazon ad (user images)).
If any of you have other recommendations too, I'd be glad to hear some of them as well. Links and pictures are welcome.
Thank you,
- SpotOn