I have a Lovefab manifold which I'm happy with but it did arrive with some issue's that needed sorting first, It cost me an extra £200 to sort out the flanges which needed machining flat and I had to have it modified so I could get to one of the studs with a spanner, Also the stud holes where way to big and it could be moved around on the studs at last 1/2" up and down or side to side, Which made it difficult to line up properly.
I'm not saying don't buy one from Lovefab because Cody is a good guy, Just make sure you're happy with the spec and make sure it arrives in the condition you would like it to be in, ie it fits lol.
You could also use Protech which have a good rep, I have a couple of friends with their manifolds, And they are both very happy with their purchases.
Rob