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For a production environment, you should be able to "safely" count on pushing 500 Mbps through a basic 4431 or pushing 1 Gbps through a performance upgraded 4431.
I'm unsure how, even if you can find it, helpful a PPS, as defined like in http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf, is really going to help you much as it really tells so little. For precise performance, you need to benchmark, like what was done for the whitepaper I provided. Without that, Cisco's (performance) bandwidth capacity is a good generalization.
If you want an estimate of PPS, just work backwards, for example, 1 Gbps equals 1.488 Mpps for minimum size Ethernet packets.
Again, without detailed benchmarks, performance sheets, like the old router performance sheets can be very misleading. If you carefully study the whitepaper I provided, you'll find many example performance is non-linear. I.e. knowing one PPS rate, for one packet size, for just packet forwarding can be far, far off from actual performance with live traffic and live feature usage.
