Winter Build - Short Block Opinions And Experiences Appreciated

Been a while since I last posted, but I need some help making decisions for what I will be doing this winter. Right now my car has the PI head swap and your basic bolt ons. I have saved my money and want to start fresh. My goal for the car is somewhere around 425 - 450 horsepower from the motor. I don't take the car to the strip, and it's more of a weekend play toy....but that doesn't mean I don't want more power. I am looking at buying a short block from either MMR, DSS Racing, or Coast High Performance. I am going to stick with a 4.6, not a stroker set up, and put either a procharger on it or vortech. I'm thinking around 8-10 psi of boost at the most. From everything I have read, this set up with one of the basic short blocks from these companies (MMR 600, CHP Street Fighter series) should get me around my horsepower goal. Ialso have purchased a tKO 600 transmission for the car that I already have. I need your opinions/experiences with these short blocks to help make the best decision. The pricing is roughly the same for each option. Thanks for the help.

Good points, and I appreciate the responses. I am not set on buying an all new short block, it was just a starting point. There is a guy that is close to me that has a great reputation for building modular motors. I'll probably try to talk with him in the next week or two and see how much he wants for a rebuild with my current block. For some reason, I thought that a good rebuild with forged internals would end up costing about the same. As far as boost, I won't say that 10psi is the absolute max I would go, but given my horsepower goal it seemed to be about right.