You can do full hydro for as cheap as $200 if your lucky and aint tryin to buy some high dollar psc kit, and yes it eliminates a lot of unnecessary cross over junk.
now 200 was an extreme example, but I've seen used forklift setups go for 3 to 500 on a fairly consistent basis.
Or even then you can snag an el cheapo northern tool single ended ram, and get an orbital valve from a tractor place and some hydraulic lines and run it off your stock steering pump for less than $500
It'll be slow to response vs a double ended ram and big pump, but unless you are trying to rockrace you don't need it.
Just depends on what your trying to really do with it, if your trying to race or don't care bout spending a ton yea go psc or something like that and drop a grand.
or if your just tryin to put together a trail/mud rig and don't need super quick responsive steering (which I know you don't need for mud) I know countless dudes that have setups that work just fine for $500ish price range.
and you don't waste your time buying crossover steering parts that you'l probably later just get rid of to go hydro anyway.