Reading Comprehension

Hey guys,

as many of you I am currently preparing for the GMAT exam.
So far Reading Comprehension seems to be my only real problem (I recently emigrated to the US from Europe and consequently I am rather used to articles in my mother tongue).
I am not on a certain time limit. I would like to take the test before June but if I don't feel confident enough for 700+ I will postpone. Technically I only want to get it all done by the end of the year.

It seems that I simply read too slowly and hence wont be able to finish RC in time.
Vocabulary only sometimes is an issue.

In order to improve my RC capabilities I am looking for Online Resources that provide articles written in similarly challenging English as the GMAT passages.

I looked at wsj.com, ft.com and economist.com but they all seem to be a bit easier.

Can anyone recommend great resources?

Thank you,
Kevin

The two websites...beatthegmat and gmatclub/forum.....i know only these two...let me know if you know any...Verbal is my biggest worry...it does not mean i get fantastic scores on quants...i avg between 35 and 42....hopefully we can share knowledge and learn together...am aiming for 700+ too