I have a nos amiga from amigakit. Its great and i love it. yep comes with 3.1 rom . as for the disk drive it can be a minor issue with the copy protection on some of the later games that came out. however, i have never had this problem so its not been an issue; but its apparently caused by them using a modified pc floppy drive (allegedly) i have been told. but then its never been an issue. Also if you are going to be using a HDD and whdload it not an issue at all anyway.
best of luck
oh and i have found amigakit really really helpful and friendly too
pz