WHEN I get my AK74 this is what I am going to put on it. Figured you guys would like to hear about my ideas.
1. Ambi-Selector http://www.akfiles.com/forums/showthread.php?t=90898
What you're seeing is basically an external version of the Bulgarian left side selector lever
Instead of a hole on the side, you had to mill a slot in the bottom (and either change your grip or take some off). K-Var hasn't had these in stock for some time though.
I don't like it because it's 'backward'; as in the unnatural thumb movement disengages the safety instead of the natural. Something like a RSA or Blackjack SWIFT would be a better idea (or do the cheaper route and simply weld a tab on the safety selector). If it was the reverse (fired a .308 Galil last weekend which did it the more ergonomic way) then I'd say 'cool cool'. As is stands, no thanks.
2. http://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_id=241
I suppose the first question that needs to be asked is: 'Why do I want a quad rail?'
The model you linked won't allow you to cowitness your irons with your optics when using the standard top rail. However, MI has seen the error of their ways and teamed up with US Palm to make optic-specific top ends which will. That said, you're kinda stuck with that particular optic once you do it (unless you want to spend more $$).
If all you need to attach is an optic and a light, it's hard to beat the combo of Ultimak top rail + AP micro + offset light mount. Do you have some need that requires a full quad rail? If so, then going with the MI with an optic-specific top makes sense.
MI recently released a new mount, shades of LaRue Irondot
http://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_id=421Their Gen1 definitely had some immediate problems but the new one shows some real potential (I'm not going to be the guinea pig on this one).
3. http://www.aimsurplus.com/product.aspx?item=XEMAAKMR&name=EMA+Tactical+AK+Mag+Release&groupid=301&search=AKMR
You don't need that. While it can make it easier to release the mag with the strong hand, since the mags are rock n' lock it doesn't turn it into a real drop-free system. Also, when applying different TTP's (like mag sweeping) it hinders the action.
4. http://www.botachtactical.com/caaagakpigr.html
Perhaps a personal preference but I like plain ol' AK grips (I also have little girl hands!)
5. http://www.youtube.com/watch?v=PvcznfgvW3U If they make it for AK's & if they don't then http://www.makosecurity.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=SBT-K47&Category_Code=_stks
You don't want to use any plastic AR stock adapter. You have a couple different options, however. The two most prominent are the ACE and Vltor.
If you decide to go with an ACE block, you have several options.
There are internal and external blocks for both stamped and milled guns. I personally only run the internal blocks but you have to cut the tang(s) off for both the stamped and the milled. Once that's in place, you can just get an AR stock adapter and run that. Alternatively, you could put an ACE folding mechanism on the receiver block and have a folder too.
http://riflestocks.com/store/The Vltor is a good option if you don't want a folder and also have a stamped AK. Noteworthy that it won't work with Yugos, however.
http://www.vltor.com/accessory.htm