i was faced with the same dilemna a couple of years ago. i wnet with the 192T for a few reasons:
1. top handles make the saw more compact.
2. if you're adept at using a saw already the top handle is safe to use.
3. the 192 is a surpisingly strong saw and i cut some larger diameter blowdown with it.
4. it's not the only saw i own, i also have a husy rancher 55 for larger work.
if you're only going to have one saw and was choosing only between the 192 and the 200 i would go with the 200 simply because it has more power and is a bit burlier. however, that is tempered by the type/size of wood you'll be cutting. with what you're describing i would also heavily consider the stihl ms250 or ms270. about 4lbs more in weight than the 192, but the option of a bigger bar, and if you're clearing blowdown that's a heavy consideration.
two other things i'll add:
1. the 192 uses a smaller than standar width chain, so it dulls faster and doesn't last as long.
2. also the shorter bar on these small saws means you'll need to sharpen your chain more often because there are less teeth to do the cutting when compared to a 16"or 18" barred saw.
look at a 250 with a 16" bar, it'll cost about half of what the 200 is.
edit - get the 250 or 270 and with the money you save buy a dakine builders pack so you can carry your saw in the pack instead.
We don't know what our limits are, so to start something with the idea of being limited actually ends up limiting us.
Ellen Langer