This is an idea I had bumbling for an while: Make Revivify be a 3rd level spell, Rise Dead a 6th level spell, and Ressurrection a 9th level spell, and leave True ressurrection be availiable only to deities or epic level. You get a useful but not overpowered spell earlier, and more powerful later.
The granted power is good.
For the first level spell... hmm... Dunno. Vigor, maybe?