I'm a fan of the following developers, depending on what I'm after:
Ilford Perceptol - reduces speed, but gives lovely easily printed negatives. I use it with HP5 plus, rating it at EI 200.
ID11 when I want some speed and a little grain - normally, I'll rate HP5 plus at 320 or 400 in ID11.
DDX - is good for keeping (or increasing) film speed.
Barry Thornton 2 bath developer. You make this up from the raw chemical ingredients. Rate HP5 plus at 200 and it gives beautiful negs. Being a 2 bath, the highlights are naturally prevented from burning out. I can provide the recipe if anyone wants.
I have my own personal development times on my website.
http://www.monomagic.co.uk/technique.php which you may find helpful. Just click on the link on the left that says 'Mark's development table'
One last thing - film speeds and development times are personal - they depend on your exposure technique as well as development technique. Generally, it's best to reduce the film speed and reduce development time. That way you get good shadow detail as well as highlight detail that sin't blown. The maxim that was drummed into me when I went on courses was 'expose for the shadows and develop for the highlights'