depends what your going to use it for?
At the moment I've got 2 Yamaha's MT-03 single,660cc for my daily use which is a blast to ride and an MT-01 stage3 1110cc for longer and pleasure rides.
"Kodo feel the beat"
I had a monster darkie and it's finish was crap and always needed stuff doing to...
check you've put the battery connections on correctly,
you don't say if the bike is making any noise as you turn the key?
obviously the new battery has been charged up by you or for you yes?
I would check these things first.