The SAR's are the predecessor to the WASR's and the ones that had most, if not all of the crooked sight issues. I havent seen a WASR (or even one of the later SAR's for that matter) that had them, but that doesnt mean they arent around.
The WASR is actually just a "get around" of the one ban, and is really just a SAR with a proprietary, reduced capacity mag, that they restore to standard capacity mags and replace some of the original parts to meet the restrictions.
I have both a SAR and an early WASR, and both shoot as well as any of the AK's I have that cost a good deal more, and in one case, actually better.
I did have to replace the trigger on my SAR with a Red Star Arms trigger due to "slap". They are a little pricey compared to others, but they are also a very nice trigger. While my WASR had no slap whatsoever, and actually a pretty nice trigger, I did replace it with a Tapco G2 after hearing how "nice" they were supposed to be, and as things usually go with me, I got a bad one, and mine was terrible, and I have since replaced the original. If I ever feel the need to do another AK trigger, I'll go the RSA route again.
Just as a side note on triggers, and if your looking to put some parts up, the original factory triggers that were removed and replaced with compliance parts, are usually actually very nice triggers, and have no issues. Its the crappy compliance parts that were most always the problem. The original parts can usually be had for cheap at places like KVAR and AA-OK.
If your thinking of going one of the Saiga conversion routes, I'd suggest getting one done by one of the companies that does it professionally. You'll get a gun that is for the most part correct, and you'll also have a recourse in the odd case there would be a problem. I personally wont buy a US "kit" gun, or any of the home built guns, just from experiences with them. That goes for any of them too, not just AK's. The professionally done Saigas are not going to be cheap, and at the higher end of the price range. They are also about as close your going to get to a "real" Russian AK 100 series gun.