flat top m4 tactical/fun optics and sights?

[BULLBLASTER]

I just finished up an m4 build with a flat top upper and no sights. I would like to add a tactical/fun zombie patrol scope or something cool for sights. Any reccomendations? For now I would like to keep around $200.  Was thinking like a 1-4x scope and a red dot on an angle mount or.something. but open to suggestions.
Thanks

[Jim the Plumber]

Leupold makes a 1-4 HOG scope that might fill the bill @ just over your price limit. It has a unique reticle.
http://www.leupold.com/hunting-shooting/scopes/hog-riflescopes/

[Bean Counter]

Not sure if you can find used deals on an EOTech optic for that low as new ones are usually MSRP around $500. I sure like 'em though. 

[BULLBLASTER]

That hog scope looks pretty sweet! An eotech would be awesome but I'm not sure where to even look for used ones...

[Special T]

Cheeper than Dirt has a site that looks like the bio hazard symbol that is made to go on "fun guns".
EOTech XPS2 Zombie Stopper Holographic Weapon Sight Biohazard Reticle Picatinny Black XPS2-Z
http://www.cheaperthandirt.com/product/SCP-7500

Little more than your budget tho..

[satchel3006]

Check out the vortex strikefire. It comes with a 2x magnifier. I love mine

[CAMPMEAT]

Lucid red dot is what I have one of my AR barrels.

[BrandonWatts]

i have been looking at this one for my ar.
http://swfa.com/Millett-1-4x24-DMS-Burris-PEPR-Combo-P42148.aspx