The difference between regular glass and starphire glass in actual practice and implementation has never been worth the massive price difference to me. Looking at two pieces of glass sitting on a table is one thing, looking at a fully set up tank is another. I've never once looked at one of my tanks and said "hey, it's tinted green, must be because of the glass"
I didn't look at my acrylic, in-wall 150 and marvel at how much clearer it was than my glass tank.
It comes down to what resources you have available, and if spending the extra on starphire, which is considerable, makes sense given your overall budget. Will you still be able to afford the skimmer you want? The lights? What about all the live rock?
Acrylic is very clear, but I'll never use it for a marine tank again.