I tentatively vote fixing up the Trek. All the parts you have replaced are standard wear items (unless you get a particularly nice pair of pedals with nice bearings). Assuming the headset, bottom bracket, and wheelset are in decent condition, you already have a fairly nice bike on your hands. If all those components are blown out it might be more cost-effective to buy a new bike. Like hairnet said, you can probably get the fork straightened by a competent shop very easily, and upgrading to more comfortable, modern brake levers and stronger dual-pivot calipers will make a huge difference. Looks like the Kilo TT only comes with a rear brake anyway.

Just keep in mind that bikes with older, loose-ball bearings need periodic adjustment and repacking to keep them working smoothly. For example, a decent quality, properly maintained loose-ball bottom bracket can last years with occasional adjustment and repacking while a typical cartridge bottom bracket simply gets replaced once the bearings are worn to the point of developing play. Otherwise, brakepads, cables, tape, tires, etc. will need replacement just as often on any other bike. If you don't find much satisfaction in maintaining an older bike and keeping it on the road you may feel less frustrated just buying a new bike.