I would go with the computer. I have to agree with a lot of people that most of the shows on TV are utter crap. Also as time goes on TV is getting filled up more and more with commercials for stuff you don't want or already own.
I know you love all this technology malarky, but i would seriously suggest getting a car instead of a phone. I know you have a moped but a car would be alot better to go about in. Once you get your licence, it means you can go out to further away places and also go out with your mate's in the back.
If i was you, i would get the car, then save up for the phone. And i bet once you saved up, the newer and better one would be out.
It was very weird upgrading from a 17" to a 24" monitor. For the first few days I couldn't take in a whole image, my gaze would habitually settle in a much smaller area, like I was still looking at a 17" screen.
Works for us. Especially if you're getting digital reception, then the image can be really quite good, but I think the normal analogue TV looks awful on a computer monitor.
Get a Computer for one simple reason becuase if you get a good enough Computer you can watch TV and Movies and still play games and use the TV so its a great All in one deal!