I have a '90 9400.  My suggestion is look for a newer one with the 414 engine.  The 359 in the 89's and 90's is not near enough.  It's not bad in soybeans, but we ran corn this fall 230+ bpa and it was a struggle.  When the engine rpm drops below a certain percent of rated, the electric parking brake engages.  So we end up running in 1st gear alot to avoid this.  The '91's have a manual parking brake and the 414 engine. A much better machine.