I wouldn't worry too much about tire type on a CBR250, IMHO.
One person will love a tire and the next will hate it.
Since you know Lloyd, ask him what he has access to and recommends. I know he won't have an opionion about tires, but he may have a discount price since you helped him with his concrete project.
I also need to get new tires. I read on the cbr forum pirelli sport demons are good. Who else has tried them and what did you think? I would like to do some BIR and DCTC track days. I will be riding to the track, riding on it, then riding home so I need a go all around tire.