BGP border router for IX's/peering

Hello!

I search for a replacement for my current BGP router used for a session with IX-es and peerings. Now we use Cisco6500 with VS-S720-10G sup. We have almost reached the limit on CPU and TCAM. I looking to Juniper MX and Cisco ASR for this purpose, but maybe other vendors have interesting options?

We need mostly BGP functionality, 4+ 10GE ports, and 500K or more prefixes.

Thanks!