which one i choose, high floor unit

Hi
I wanna an advice from you guys, I am going to move to Shah Alam ( Ala Idaman Condo) in Sek 22 and there is no facilities for UNI FI or even maxis fiber so i have to go with wireless USB modems.
The Question is which modem or company is the best or suitable for me putting in consideration these points
I am living in high floor (21)
Area : shah alam
Heavy internet user, downloading,streaming
Best quality of services
No availability of wired services

TQ and please