For your purpose, you need something custom built, not chosen off a menu.

You want reliable, low maintenence, not too costly, 700 + horsepower.

If I was you, I would build a 540, 4.5 bore x 4.25 stroke, about 12.5 to 1 compression, with steel rods and all off the shelf parts, plus a flat tappet cam with about .650 lift, that is probably the cheapest short block you can build. Put your $$ into a really nice flowing set of heads.

Don't get too exotic with rods, rings and pistons, you don't need to spend the $ or deal with the maintenence. Roller cams are great for making power, but to run 10.50's you don't need it, and again it is a lot more $$ and maintenence to run a roller cam. If you keep the lift down in the .650 range, and the rpm reasonable, you won't need high dollar, high maintenence valve train parts, just use stock rockers with decent push rods and the motor will live for many years.
If you decide later you want to go 10.0's, just upgrade to a roller cam and better valve train and you'll be ready to go. Good luck! Joel