favorite robot power supply modules / electronics or kits ?

Does anyone have any favorite robot power supply modules / electronics or kits they can recommend ?
Ideally, I would like something that lets me:
1) connect 2 or more 12vdc SLA batteries in parallel for longer lasting power 2) recharge those batteries with a single external connection; a switch to select each battery to charge would be acceptable but it would be nice if it was automatic 3) provides typical useful output voltage connection points, such as 5vdc for logic circuits; unregulated 12vdc for motors and other heavy duty devices 4) perhaps has jumper selectable output connections for RC servo power, etc
Am I dreaming pie-in-the-sky here or does such a product exist ? Might be something I have to design and build myself, but I'll take all of the prebuilt and design tested modules I can get away with.
Thanks again, as always ! JCD
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