The 200 is effectively a 250 without the more expensive casework (which confers better heatsinking and so can be set to give a higher power output) and I think that the 200 is the one to go for on grounds of best value for money.
I agree with IanG. Go 200.
All too often we can end up spending more money in our effort to save some.
We go for the cheaper model and then not long after we realise that we should have set the bar a little higher.
It's happened to me many times.
But "a man has to know his limitations" and a 120 could be just the ticket.