Go for the SE5. Most of the time you can use only A+B, but also you can experiment with additives. Omega is second bath that will give you some more strong color (depends about paper type also) and more deep black. For me it was not difficult to use SE5, but as usual with Lith print - you can not control all . Moersch has nice pdf's for free on English on his site that explains a lot.

regards,