Nobody on this site belongs to the CB (CHEAP BASTARD) club!!! Just go with the Lo Presti remember money is no object (Sadly not for the C)!
Options:
Cost ($), complexity (X), Cooling (~) Speed (Z) and Coolness (O) (O for the big O factor not 0 for zero) (N for neutral)
Lo Presti $$$$$ XXXXX ~?~ ZZZZZ OOOOO (not for your C)
Sabre Not Yet available $$$ XX ~?~ ZZZ OOOO (assumptions based on threads V2 is yet to be tested) (might be to long for your C)
Money Mart no longer available
SWTA no longer available (someone can step up to buy the STC and start making these again, just call them to talk with JD)
ARI $$ XX ~~ Z1/2 OO (What I would do for your C)
Lasar $ X ~~ 1/2Z maybe gets one O
No Mod N N N N N
As far as cooling goes: Based on my ratings as you can see there are some cooling advantages (Honestly not much from what I can tell and does depend on other factors as well) but all cowl mods are fairly close based on my research and the Lo Presti maybe neutral to positive and Sabre has not been tested on his current mod.
For me I am trying to wait for the Sabre Mod. Remember the ARI(I might do while I wait for Sabre), Sabre and Lo Presti all require the 201 Spinner which adds to the cost over the Lasar.
Opinion only from a PP who has been looking into the mod for several years now!
Don't forget the OIL COOLER MOD that is required for some of these as well and maybe the mod to start with. Overhaul the engine = buy a new oil cooler and have it relocated (I did mine last year).