Beware, buying payware is addictive. I just started a couple months ago and I've spent $275 CDN on it already.
I have the FSD Seneca and I love everything about it except for the panel. I personally don't like how they put so much on the panel at once and used small gauges to accomodate it. I'd much rather remove the GPS and Autopilot controls from the right and have the panel zoomed it. I have a 21" monitor and I find it impossible to read the numbers on the engine gauges. Personal preference I guess.
I also just got the PMDG Beech 1900D. The plane looks and flies great. As you said it isn't an indepth simulator, but more of a just pick up and fly aircraft, which is another reason I like it. Between long scheduled IFR flights it's nice just to hop in, fire up the engines and fly.