http://www.sarna.net/wiki/Wolfhound
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It's supposed to have a rear-mounted medium laser, but never mind that. Here's how I'd have it.
What does this thing have, that the JR7-F doesn't have? Well, the WLF-1 would have the advantage of 3 energy hardpoints in the arm, which is pretty cool on a fast light mech. The WLF-1A would be faster than the JR7-F and have 2 AMS. The WLF-1B has more firepower than the JR7-F, though most of it is in the torso.
The JR7-F has different advantages compared to either of these, but jump jets is a pretty big factor.
We need more light mechs. We need the Wolfhound.