I just now got a package with my Kore Race II's per Zephyr's recommendation. $34 shipped from chainreaction, & just by holding them to the bottom of my shoes they already feel super grippy. Granted they're bricks compared to your other choices at 600g/pair, but they're cheap & seem to be well built/designed.
Between your options, it's a tough call. I like the pin arrangement on the Wellgo's better...more pins focused towards the outside of the pedals. But I prefer the actual pins on the Fortes better...they appear to be smaller & easier to seat in between the crevices of your outsole. The Forte's also look a lot nicer in overall style, but in the end it's grip over style for me (hence me buying my Kore's...they're freakin' hideous) so I'd probably go with the Wellgo's.