I ended up replacing the front dome light with a red LED module. The front dome/map light in my LC doesn't turn on with the doors. It gives plenty of light to read by but doesn't kill my night vision like the white light did. Hard to see some lines / text on maps (if they happen to be red), but overall a good mod and only about $5 from Amazon. This is similar to what I got: http://www.amazon.com/dp/B00ELOF36CI know you said $25 max and I'm fairly certain this particular one is more, but a few guys have mentioned alternatives.
Point is the single best thing I did was a gooseneck map light. This particular one is the Littlite L-7/18A which uses a halogen lamp, has a dimmer and an 18" long neck. Probably cost about $50. When I got it 15 years ago (it was just about the first thing I ever did to my truck) there was no LED option like now. The LED ones are about $75, so it quite a bit more than your limit. But soooo very useful.
These work so well for me that I only bring a headlamp and a bunch of these scattered around the rig for camping trips. Magnetic, bright, and a clip to hang from clothes. Also bought rechargeable batts.
I have one of these NEBO Larry 8 LED lights in my rig. Mine is clipped onto the inside of the soft top. However, it's also got a magnet on the clip. I've used this thing so many times. You can attach it to things on the engine bay when working or wherever there's metal. It's $10 and worth it. Plus, it's crazy bright.