Good Lab Bi-polar power supply

I have a 0 -30 vdc lab power supply which will produce +- 15 vdc as a Bi-polar supply. It is nice as a beginner tool, now I would like to buy a Lab Supply that will give a +- 24 vdc as a minimum and +- 36 vdc would be nice, just not sure how often I would need that much voltage. I can find 0 - 60 vdc models of my current supply, but I would like a better quality supply. Something I can trust to work and be accurate and somewhat clean of noise. I'm willing to spend up to $300 for a quality tool.

Any suggestions?
 
Llambda supplies (we jokingly called them Kablamda at my last job) (HP as well) are on the pricey side. One option I suggest you check out is supplies form Topward. They have a 2 X 60V, 3A model that I use in a lot of my work. If that amount of power is insufficient, Instek makes a dual power supply with higher current capability.

I have considered making a dual switching supply using a buck regulator that regulates a constant voltage across a linear pass element, for a cleaner approach to an SMPS. It's one of those projects that I'll get around to eventually...
 
Thank you all for great suggestions, I've spent the last couple of hours locating the owners manuals for all of the supplies mentioned above. It was a very difficult decision since every one exceeded the quality of what I thought I could afford. I ended up with the Instek 3030D, the higher current was what attracted me to this particular supply.