Depends what you want to do if you going to play games then maybe OS 1.3 or 2.0.
If you want to get the full out of the 030 then maybe put in a KS 3.1 Rom and install OS 3.9 + patches its the best OS for nearly everything pre OS4.
That way all you have to spend is for the KS rom and os 3.9.
But its depends on what you want to do, I use my A2000 as my work horse i transfer files/ play around with apps/ pretty much everything its the most used amiga I have an 040 in it and OS 3.9 and opalvision card (i know but its just ok :-D :roll: ).
