Hi rtm038,
Wow, I see you joined TBN in 2004 but are just now looking to purchase your first tractor. That may be a record.
First on the subject of haggling, YES by all means. Call it negotiation if you want to use a better word. More than pitting the JD dealers against each other or the NH against themselves, try to remember what pros you like about each competing brand and use that when talking to the other brand's salesman. Such as to JD sales guy "the 2520 is a nice tractor, but I really like (blah blah) on the NH1110". They really hate to loose sales to competing brands. Its all about market share. Heck, in my area 5 of the 6 JD dealers all have the same owner so they don't play those games with each other, but talk about liking a blue or orange tractor and they tense up a bit. I got about $4000 off list on my 2520 TLB combo this way.
As to your orginal question on hydro operation, yes the 2320/2520 will behave the same as the NH. They have a simple mechanically controlled hydro. As others have mentioned the bigger 3000/4000 Deere's have E-hydro which is micro-computer controlled. Its probably nice to use, but to me, its just more to go wrong as the tractor gets older. And yes, Hydro is the way to go for frequent loader work. Also you will want to use the brakes when on slopes, unloading from a trailer, or similar places. Finally, if you test a 2520, you will notice that you have to put the hydro in neutral if you dismount with the engine running (or the engine shuts off). So in that situation you have to set the park brake or the tractor will roll. The safety interlocks on different brands and models may act different in this regard. Its one of those details you should notice when shopping.
Good luck in your shopping