man that would suck to have to move after all that you have done. i see your point with the lights. although i was thinking about the little mushroom lights that you bury. also, i would only get the solar powered version with the led's. the solar powered variety with incandescent bulbs are not worth a crap(im sure you knew that already but, for those who don't). i guess though this would only be an option if your gonna stay but, something like this:

http://www.homedepot.com/webapp/wcs/...3+90401+500665

you could also get a longer wire and more lights and run them all the way around the track(with enough funds and the led lights you could make it look like a runway thats seen from space). if you put them on the inside of the track you wouldn't have to worry about them getting dirt kicked up on them(dont think this would be a problem unless they are flush with the ground and your TWS would help with this also). some ive seen stick out the ground maybe an inch or two and if you did run them over i doubt it would hurt them. it would be like a little speed bumps. or if you wanted to actually light the track get some of the spot light variety and put them inside the corrugated tubing(if it were me i wouldnt really care about the straight aways i would just wanna know where the boundaries are.) make it a little more challenging. if you have lights on your rc car you really wouldnt need to light the track. just do the boundaries with the red and white reflective tape(good choice if you are moving).

it would be rather time consuming and it wouldn't provide much light but, you could use the outdoor christmas lights(all white) and run them on the top of the tubing. then you could daisy chain them together all the way around the inside and outside of the track.

just looking around i came across these(bored and brainstorming):

http://www.bellacor.com/productdetail/405369.htm

these would look really cool to run down the middle of the track. just bury them as well and just leave the top portion sticking out(so it lights out the sides and even if some dirt gets kick up on the top you could still see). could also wrap the tops with packing tape to protect from skid marks. you would need a few sets though so, it wouldn't be very cost effective and then the problem with tilling but, with the loose dirt after tilling they would be easy to reinstall.