Aftermarket power steering units for 09 450 grizzly

I am contemplating putting a powers steering unit on my 09 450. My Girlfriend mainly rides it. I love this machine because it could go places my 09 550 would only get in trouble. It does bet you up more though. My 15 700 handles a lot like 450 & my girlfriend thinks power steering on 450 might help. I am debating power steering vs an upgrade to 550/700 with wider stance tire. I am sure the difference in suspension between the 2 will be next issue lol.
Of those of you who have opted to add power steering, did you go aftermarket or OEM? Who makes good units at a decent price, preferably USA manufacturing ??? I am almost ready to upgrade GF and put 10 yr old grandson on 450 that he has driven on and off with on board guidance and supervision for last 2yrs, but also understand power steering would help him too. A guy I ride with who runs a RZR claims he added power steering to his ride for under $500. Stock units for my 15′ 700 run $1200 thru partzilla. Is there a suitable aftermarket alternative that isn’t a cheap POS ???:gcrules::gcrules::happy: