i'm going to go ahead and say it: anyone who tries to compare a "FMR" car to a true MR car has never driven an MR. there's a DRASTIC difference between a 50/50 and 43/57 weight distribution (F/R). there's still a good solid 3 or 4 feet difference in engine placement between front and mid engine.
back to topic...
yes, MR2 spyders do handle that well. even with 140bhp they are TONS of fun; think miata levels of driving enjoyment. i'd love to have a spyder to add to my collection, but there's no way i could justify having that more than the FRS. however, in your situation it's a much more difficult decision to make. honestly can't say without a test drive, but it sounds to me like the GT86 would be the better choice for you. either way let us know what you end up with!
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1991 MR2 Turbo - 2.1L high compression stroker 3SGTE
2006 Tacoma 4x4 TRD Off Road - All-Pro front bumper, Old Man Emu shocks, Old Man Emu HD front coils, All-Pro leafs
1990 240SX Coupe - sold
2008 Civic Si Sedan