Yes, Peck's advice is good. I don't collect Roman coins, but I do deal a bit at markets in the local area. I find Roman coins in good grades much easier to obtain than most of the hammered English.
A collection based on as many Roman emperors as you can get, is a good target. Don't forget the wives/daughters/mothers, who also appear on quite a few coins.
You will find, a bit like English hammered, that you can get the majority of the names fairly quickly, but then it gets hard filling the last few. Some emperors were only around for a few months, or only held sway in a small part of the empire, and those can be tricky and expensive. When you get down to the likes of Galba, Otho, Vitellus in the early days, or Carausius, Allectus and Marius in the later days, you will find your budget being tested more!