I also like the Hawke RD25; picked up a boxed mint s/h one off here for just £17 collected.

As you say, compact with a nice small dot. The 4 MOA dot (4" @ 100yds) is more than good enough for my needs.
The brightness adjustment dial is rather firm, but that is a good thing; helps prevent turning it on accidentally (avoids flat battery).

I also have a JSR 30mm red dot (looks identical to the Hawke RD30) that I previously considered to have a nice small dot, but looking on the Deben website, the RD30 has a 5 MOA dot. The RD30 is on large size, but the single long mount can be useful depending on the application.