Tim, If you do it right, all the modification really don't hurt your on road performance. Mine (both) are daily drivers, heavily modified, and drive great on the highway. The biggest problem is a few less mpg. I've beat the shit out of my truck the last two weekends and it is still fine and drives great.
You will break things from time to time, but it can be fixed. Actually, you'll learn how to fix it yourself and will be less likely to t be stranded on the highway.
With all the mods, I think they drive better than stock. You just have to work on it to get things dialed in.