Why do you need a high c to play metal? A 5er wont do the Job? Sr305 os very nice for metal. If you can spend more money a 505 si great but a bit to jazzy
I had my MIM P for 150 bucks on craigslist, a total bargain! And it had a nice duncan pickup and schaller tuners. You should try to find one although I know I was very lucky
You may want to keep the 4 as your main and use the 5er only when you need a low B. If you get confused is only because you need to spend time practicing with both
http://youtu.be/q13RosdOOaQ
Here it is, me and my friend with our version of summer time. I am the one in the left, playing with a 5 string Ibanez setted with a high c.
Cant wait ti hear your thoughts