Roland,
If you get an older one, you will spend money and time keeping it running. Triumphs and BSAs used to be called magical motorcycles because they would turn any ordinary man into a master mechanic in just a few months. I loved them anyway.
Triumph of Chattanooga sells the standard black Bonneville new for $6,333.00 out the door. I don't know if left coast dealers can match that due to shipping (Chattanooga is just a couple hours from Newnan, GA). But you can try. You may look on ebay for a Yamaha 650 (very vibratory, will numb your crotch quickly) or a newer Kawasaki W650 (looks just like an old BSA and suppose to handle like a dream). Hey, a Kawasaki 650KLR would be a great second bike - you can ride anywhere since it's dual purpose. Take off down the Baja Penninsula for a fun weekend. You can find a nice one for $1500-$3000. Good luck!
Ride Safe,
Dennis