Dust of the Universe
It is very likely that you have this page bookmarked on your computer already. Ziad Bassil is almost a household name in the paragliding community world wide.
If you can't demo wings that you are interested in, check in to this page and chances are he will or has already reviewed the wing for you. I have used the info on his page many times!
FlyBubble Paragliding
This website / shop / school is based in the UK. They very regularly post reviews and interesting articles about new gear. Their Youtube page is just as useful.
Paraglidingforum.com
Nothing beats hearing personal impressions from other pilots. On the paraglidingforum you can find a "gear discussions" sub forum with other pilot's opinions about specific wings, harnesses, flight instruments etc.