I have one of those Target cases. Handy, especially since I started building my own medkits with better options than the glorified boo-boo bandaid boxes they usually sell as "car kits."

I tried an old-school wired bike computer years ago and found it more of a nuisance than anything else. I more recently bought a handlebar bag with a clear plastic sleeve on top designed to hold a phone. Basic map apps cover speed, etc.