If I were you I would wait for the 05 superstocks to come out. They will probably retail for around $640 which is a great price.

I personally have an 04 prostock with an E2 and it is fantastic with everything else stock, definately a solid combo. But if you are looking to save $$$$ I think the new 05 is your best option. (Price tag depending on where you get them will vary ~ $800-$950 + installation)

If you dont care about whether its an E1 or E2, then you can most likely get an E1 for $300 or less as well as a prostock for close to $300 as well.