Im sorry, but there is no chance someone is buying an autographed Ricky jersey for $700-$1000 unless they are smoking the same stuff as him. Back in like 03 or something MAYBE. Not now though, regardless of who has authenticated it. I think you would be lucky to get a couple hundred nowadays.
And yes, PSA/DNA is good as well, but the companies I mentioned above are equally reputable. Collectors know that Marino has a contract with Mounted, Jeter with Steiner, Lebron and Tiger with UDA etc. JSA isnt too bad either. STAY AWAY from GAI/Global.