I'm about to buy my first ZTR this week. I've decided on Exmark because of a good local dealer and recommendations by friends. I can't decide between a 50" HP or a 52" AS. This is for homeowner use. I have 6+/- acres I cut plus 1 acre rental property. Terrain is mostly flat with a few small rolling hills. I have 75 3 year old black walnut trees planted on 10 ft centers on the property. Right now about one acre near the house is very nice with few if any weeds, the rest is "pasture grass" that I want to replace so the entire yard looks like a ball field. I will cut at 3-3.5". Pasture was previously cut with an 8' Finish Mower (5 hour job, mostly from turning tractor around) What are the advantages/disadvantages of one of these vs the other? I haven't priced the HP yet but the AS with mulch kit, striper and lift assist is going to run me about $8100 with tax. Should I expect the HP to be more or less?