I am getting an HTC EVO 4G for use with the freedompop phone service, I am looking for the best rom for me but there are so many to choose from, will someone please help me out? Here is what I am looking for in a rom:

- Latest version of android possible without losing any features on the phone, not sure if this would have to be Gingerbread or if it could be a later version.
- Stock look for whatever android version it actually is, (if it's GB it looks like GB, if its ICS it looks like ICS, etc. basically minimal changes to the visuals)
- Most efficient battery power possible while retaining the above ^
- Largest feature set possible while retaining the above ^

Thank you for any help you may give in advance!