really depends on what you're willing to spend...
$300 or so will be a greddy copy. there is a trader on here (vulture motorsport I THINK) that I can vouch for. the biggest problem with copies has always been the edgeing and the space between the water galleries and the air intakes. The vulture plenums are just fine. I filed down the edges a tiny bit because there was a slight lip on them and I'm anal. Really not necessary.
above that, $500+ or so, I would go plazmaman. the design has had a lot of time put into it to work well with the tuned length runners as standard. The ONLY reason I didn't do it was because I thought the Greddy plenum looked better, that's all! It's proven itself time and time again, not a waste of money in any sense.
$+++ I would choose Hyertune. These run on all the finest cars, high power or not. Just looking at them you can tell they have the best entry angle, are super high quality and have great volume. They look great too! But price is easily in the 4 digits. Unless you're chasing every tiny piece of performance, not completely necessary...
There is also a user on here, can't think of his name right now (I think it starts with an 'S' like SL33PY or something, he makes somewhat custome CNC plenums, very good quality), but if it is custom you really need then I would ask him...
Hope this helped!