Ive got vaughn brooks,nimba,mousehole,peter wright,kohlswa,hey budden,arm & hammer,fisher,jhm, trenton from 25lbs to 560 lb and a big refflinghaus on the way.( four month delivery )
there is not a lot of difference between any of them except the fishers.
id take a new cast tool steel anvil over any of them anyday but thats a matter of preference.
i like the 560lb vaughn brooks , the 450lb nimba , the 260lb JHM , the 209lb kohlswa all cast tool steel anvils the best but havent gotten the refflinghaus yet.
I would suggest that you purchase the largest anvil that you can afford no matter what brand that you choose.
You can do small work on a large anvil but its hard to do big work on a small anvil, in fact doing to large of work on too small of an anvil is the main reason that its hard to find a 100lb to a 150lb anvil in decent shape.
that just my opinion and you know what they say about opinions.
Your'e likely to get more opinions on anvil size , style , name brands than any other question that you could ask.
Good luck on your quest
Mike Tanner