Dual WAN Router - Bandwidth limitation on 1 WAN

[Ttown]

Hi all,

I had an ADSL2+ 8Mb/1Mb approximately (1TB monthly allowance), but with that not enough upload bandwidth.
I migrated to a Ethernet 4Mb/4Mb (unlimited monthly allowance), but our Internet experience has gone down too much on download.

I wish to implement a Dual WAN Router (Cisco RV042) to use my current Ethernet connection and my reactivated ADSL2+. That should give me a better download experience when browsing, and keep my high upload.

But I wish to limit my monthly bandwidth usage on the ADSL2+ to 150GB (reduced from 1TB) not to pay the extra usage.

Would you have any idea on how to achieve that goal with a reasonably priced solution...

Thanks all.