Just use straight 2 row, it has everything that the yeast need to thrive, mash low and long, give the enzymes as much time as possible to make the starches into the right kind of sugar. We use weak wort for starters as the high gravity wort exerts pressure on the cell walls that is not good for them. So mashing low means that every bit of sugar in the wort that is adding to that cell wall pressure differential is fermentable.
However if you are really cheap you can do what I do, save stuff from the dead space in your mash tun and boil kettle. I usually collect this and strain out as much sugar as I can from hot break and mess. This with usually feeds my batch of yeastises for my next brew. It adds a bit of time to your clean up on brew day but it makes use of every available bit of sugar in your grain.
Clem