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is there a game similar in size to 40k out there?
I know that mantic has their game coming and am familiar with infinity but are there any other sci fi games out there that could work mechanically as a 40k alternative?

I was just wondering if there was anything with less clutter that I could use my 40k figures and terrain with.

https://onepagerules.wordpress.com/portfolio/one-page-40k/

I've yet to try it out in anger, but it looks to have a lot of potential and many seem to like it.

Well, I'd suggest Warmachine/Hordes.
The rule set is much tighter than that of 40k with no gaps and loop holes. They also have a tournament setting named Steamroller. Have a look at battlecollege.org for armies, units and models.