I think Greg is right in the long run.... however as a Diversion 165 owner I can tell you that there is something to be said about buying small and stepping up later. If you go this route though be sure to buy good equipment as the resale value will likely be better when you are ready to step up.
So having typed that... I must admit there are times that I wish I would have waited and saved for the Dynasty. I have not yet really needed more machine but I KNOW I will need more machine some day. I did get a really good deal on the Diversion though so I couldn't pass it up.
Don't count the smaller machines though. I have done some pretty large repairs with my little Diversion. Well, larger for a 165 amp machine the Miller Sync 250 I used to run would have not even broken a sweat on any of the jobs I have done at home.
I do like the arc the inverter machine puts out though and I can only imagine how well the Dynasty works!
Chris