desertdog,
I bought the smaller one only because it's just my wife and I 95% of the time.
There is some ash buildup but it's not a big deal, I vacuum it and give it a thorough cleaning every couple of cooks. I think the pellet cookers are the way to go, the key is to get quality pellets. I buy mine from BBQ Delight, they are $34.00 per 40 pounds including delivery.
Nothing wrong with gas, I have a Weber gas grill, can't beat it for, steaks, burgers, hot dogs, etc.
Now, as much as I like the Traeger I would rather have bought one of these:
http://cookshack.reachlocal.net/shopping/pgm-more_information.php?id=88&=SID Guys on the competition circuits are kicking butts with them (No pun intended).
At the recent comp in Key Largo, Fl, four of the top five teams cooked with these. I did not buy one because it's much larger than I require as well as a lot more money. I waited two years hoping they would develope a smaller model before giving up.
Now to really add to your confusion take a look at these;
http://www.americangrills.com/ It appears to be the best of both worlds, pellet burner and a gas grill. I do not know if you're familiar with Jim Minion, he's very well known in the BBQ/Smoking community. He told me that the best butt he ever cooked was on one of these. Again, too big and expensive for my needs.
For what you are doing I would lean toward the pellet/gas cooker. Some things just require the high heat that only gas can give you.
Email me if you wish so we do not bore everyone else.
Good Luck,
John