Modwright vs EVS vs RAM vs ASI-Tek, OPPO BDP83

I recently bought a OPPO BDP83 BluRay player and the performance is very surprising for the $$. I'm interested in getting a MOD for the 2-channel audio. I understand ModWright, EVS, RAM and ASI-Tek offers mods ... can anyone offer recommendations? ... comparisons between them?

I have a ModWright Transporter and is satisfied with the performance ... I understand EVS also offers a Transporter MOD, has anyone compare it to the ModWright?

Thanks!