Brake Rotor - Float or not to Float

I have 01' Honda Shadow Spirit VT1100C, the front brake rotor has a little
scoring and is right at 4.5mm at the thinnest. (4 mm minimum stamped on
rotor). I am considering a new one, but Dealer wants $320.00 !! I thought
this was a bit high to say the least, so I did some searching around on-line
and found a couple of places that have the OEM rotor, for close to same
money. I did also find some aftermarket for around $160, still high, but
better. The question is, these aftermarket seem to be "floaters" where my
OEM is solid, what are the pitfalls of going with the "floater" (I've seen
the floaters on my buddy's Intruder 1500)?

Alex

Side note: I think I may turn the one I have but I doubt I'll get more than
6 mos. to year out of it, so I'll still need a new sooner or later.

 

OK, so no one who really knows is biting so I'll have a go.
Lots of bikes with really powerful brakes and capable of much
higher speed than the Shadow use floating brake discs.
So as long as the part is specifically recommended for your exact
model and year and comes from a recognised brand - go for it.