Powertraxxx

Hello all, I have recently purchased a '94 legacy L sedan and wanted to get a security system as I am upgrading my sound system. Anyone have any knowledge as to what might be good or what might not be. I would also like to get keyless entry with this system (hopefully all one unit). Please let me know if have any advise/experience with alarms. I am mechanically inclined so are there any worth installing yourself, or better left to the professionals? Want to make sure alarm covers trunk being tampered with as well. Thanks for ANY helpful suggestions/comments, don't really know where to start! Bryan