Klipsch FII's with mods vs. FIII's

I am not sure if I should buy a pair of Klipsch Forte II's and do a Crites crossover and Ti  tweeter upgrade, or get a used pair of Forte III's. I read that the III's have an upgraded mid horn, has a better crossover and titanium tweeters. It would run about $1600 more for the III's after the FII upgrades. Question is, do I approach the sonic quality of the III's for less money upgrading the II's?  Is it close enough to save the bucks and use elsewhere? I'll be powering them with an integrated Mac 6200 putting out 75w/8 ohms. 
Thanks