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I would not advise using a NPE-300 for 200 to 300 Mbps of traffic. Worst case (minimum size) Ethernet requires 148.8 Kpps, per 100 Mbps, so 300 Mbps (duplex) could need about 900 Kpps, much more than NPE-300 supports. Features, such as shaping, will also consume CPU cycles. So, in the 7200 series, you'll likely want a NPE-G1 or -G2.
In ISRs, a 3925 might just do, a 3945, 3925E or 3945E should do. Older ISRs, look to be too slow.
The ASR 1000 series has the performance; assuming they support shaping.
Besides routers, newer LAN switches, e.g. 2960 or 3560/3750 series (any generation), support "shaping" by controlling the transmission cycle of the port (srr-queue bandwidth limit).
In switches, I think some of the MetroEthernet varieties support shaping.
