I started out really thin, under 120, and wanted to hit 155ish to be officially overweight, then gain "several" more.
I've partially achieved that, as my weight ranges from 159 to 164 at the moment (I tend to work very long and hard shifts on Sunday, often eating nothing aside from maybe some water and a small snack, so by Sunday night, I'm at my lowest weight). Just weighed in at 159.4 - but I was 162 when I woke up this morning and hit 164 a couple of days ago after a rather large stuffing. It might sound like I'm losing weight, but it wasn't too long ago that my "floor" weight was 155. I'll probably be back up to 162-164 by tomorrow night.
That said, when I was back around 120-140ish, I probably would have said my ultimate goal is 170. With that so close, I think I'm aiming more for 180 now. I guess it depends, the next 10 or so pounds might make me feel sufficiently fat for the time being.
With a feeder, I think I'd commit to 210 or so, but anything beyond that is too far off to say. I can't say I wanna be 500 pounds or anything without having ever seen 200.
At the same time, I enjoy stuffing so much, so I can't say I'd hit 180, 210... or whatever and be like "okay, I'm done with this".
I curse my fast metabolism right now, because I need to gorge myself for several nights to start seeing gains. At the same time, if I hit a weight I'm happy with, I kind of hope it's still there, so I can simply maintain my weight if I so choose.