Lear 60, no questions about it, itīs the machine to buy. Iīve flown citations in the past and the lear beats all of them. Get an experienced pilot to fly with you for a couple of months and thatīs it.
What has been said about maintenance forget it, never had a big issue on the lear. NWS never failed and about freezing itīs a beast, at least you donīt have to remove batteries like on falcons.
RoC, well, Iīve done 17.000ft/min on it. Expect to get FL400 in 9 minutes.
Get one with the new 3 disc brakes, those are the good ones.
BTW, if you are finally decide to buy one I know one on sale with just 1.900hrs, full uploaded, 2007 built. I can deliver that to Argentina in exchange of some Bifés !!!!!