To clarify, PS should only be needed about every 6 months, not "every couple." For a daily, PS is a great base layer, and HGG ever 4-6 washes is perfect for maintenance. Super easy to apply, it'll also add awesome shine. BG really adds some pop, but it doesn't last very long at all. Read this for more insight: http://www.adamsforums.com/topic/27631-faq-should-i-use-wax-or-sealant-on-my-car/, and see what works for you.
Feel free to ask any questions you have...we are all here to help!