I'll usually wait until Norelco's second or third from the top of the line goes on sale and then buy one before my current model dies. I've found that the very top of the line is expensive and for nothing I need or use.
I cannot shave with anything but an electric. Even the best quality blades just shred me. Fortunately, I can get away without shaving for a week. Even longer if I don't have meetings, court, etc.
I normally don't even have to trim my goatee and mustache more than every 2 weeks. Less frequently if I use my new mini torch to light a cigar and I'm not paying close attention (as I've recently discovered).