There is no such thing as a vz-58 flat - they are milled receivers, sorry. Czechpoint sells receivers occasionally, but the vz-58 is rated a difficult build.
I have owned WASRs and Hungarian AKs, and 1 vz-58. I am MUCH happier with the vz-58. Mine is more accurate, (I have the vanity to think I know how to shoot a rifle, to the poster who suggested otherwise), lighter, and it came perfect out of the box. Last AK I had that didn't need work was a Hungarian I purchased in California back in 1987...The WASR we got rid of was a Century with tilted gas block and needing a Red Star trigger group.
The vz-58 DOES have longer stocks and accessories, go to
http://www.czechpoint-usa.com/ for some very cool accessories, such as the Neit Arms extended bolt release and ambi mag release. I can drop the mag, release the bolt and manipulate the safety all with the right hand in a firing grip. Also, mags are not QUITE as cheap as AK, but $13 a pop from Czechpoint is pretty good. Mags are also more durable than they look. BTW, Neit Arms also makes a bolt carrier with the handle on the other side, up at an angle or flat, or even ambidextrous. Great guys up there.
I have no direct knowledge of the Century built/imported vz-2008, but what little experience I have had with Century the
company would make me hesitate a LONG time before ordering something from them. The warrantee starts the day the rifle is BUILT, not when it is sold. Czechpoint stands behind their products 110%, and Dan is one heck of a great guy. I will say I have heard some people state they got very nice vz-2008s.
My vote,
vz-58