I"m searching for proper specs for RB V3 fitment currently, looking @ Forgestar in similar size as you. The M14 is the wheel we are probably both gonna have to end up going with. On the plus side it will be well within your budget as even if you fully spec them out w every possible option a set in 18x11F and 18X12R or really any 18 in this style will come in just @ or under $3k shipped, and if you go w "naked" or "raw" finished ones that you can then get powdered or painted yourself should actually run closer to the $2200 price point. Hope this helps you somewhat and adds to the karma train to aid in my search for proper fitment specs as well bro.
Edit: FYI the M14 is a 2 piece wheel fwiw bro. Go to
www.forgestar.com to check em out