If money was
really no object... then HST with scheduled maintenance (and of course a seat on those flights). Might need to employ a few people to help process those pretty galaxy pics
If I had to be constrained by something approaching achievable "reality"... then a nice wee patch of ground at a dark-sky location, a cosy cottage/cabin/house, and a big SDM Dob. Maybe chuck in an observatory-class imaging setup (e.g. 16" SCT, equatorially-mounted or other) for fun!