Question about having a second domain point to the primary site

If I have the domain Sprockets.com and wants to get more hits for keywords "sprocket hacks", would it be permissible to get a second domain such as Best-Sprocket-Hacks.com and have it point to the first site via redirect or link? How could I best do this without SE penalty?

Would it be better to just do Sprocket-Hacks.Sprockets.com with a permanent redirect?

Basically, there's an existing SprocketHacks.com getting half of the first page of google results and I'm stuck on page two.

vbseo only works with 1 domain. You can buy any extra domains and park it on your root/core, but it will likely never rank for anything.