I LOVE the HST on my L5740HSTC, very similar to the MX5800 and I do pretty much everything you will be doing.
Now I really like our geared, hydraulic-shuttle M8540, but for a CUT, I'll pick HST every time; owned an L5030HSTC before this one.
My brother opted for geared CUT and really wishes he had gone with HST and all of his other tractors are geared machines.
This is a seemingly never ending debate, but the trend is moving steadily to HST on these machines; go compare how many tractors on any lot are HST as opposed to geared. I checked one dealer not too long ago and he didn't have one CUT with gears, had a GST, but no straight geared ones.