The biggest reason you might want to get an Imbel is so your Imbel kit will be all Imbel. Other than that a DSA is pretty nice. I just built an STG58 on a Entreprise and it went real well. It is a type 1 receiver and has the STG58 stamped on the side so it looks pretty nice. To each there own though and I'm sure some won't like the Entreprise no matter what. Just my .02
Did you have any problem with the Entreprise? How was the fit and finish?