Well, if you arent running any other accessories then I would stay away from a deep cycle battery. They are meant to be drawn down and then charged back up and if you dont cycle it like that then you will loose life in the battery. I would just get a good quality starting battery and that will suit your needs just fine. I use Excide Orbitals because they are sealed and create no mess at all but the are around $120.00. Hope that helps.
F.J.