Beams for a terran is not the typical, primary weapon choice, but it can be fun.
Usually its: Terran/Missles, Projen/Projectiles, Jenquai/Beams. The major reason is that they can upgrade only these weapon types to level 9 (max). Another reason is that there are specific reactor/shield/engine combinations that benefit you when using the usual race weapon type.
As far as a reference to see what is available and compare and window shop, there is an old site that is fairly accurate (but not 100% as the Emulator is a new creation, with new stuff, but not everything you see there is in the game currently) --- http://home.swipnet.se/Hubba/items.htm
http://enbdatabase.net-7.org/ Is the most up-to-date reference as to what is in game, Kudos to Slayerman, Great site man! - And the Arsenal http://enbarsenal.com/ Is great too!
Happy Trails,
TooTall