I'm just getting in to collecting and find myself saying the same thing. All I want is the SSC Vader, DX 07, DX Han, Joker 2.0, TDKR Batman, CR Superman, HULK and BTTF (the whole line). After this (and I know it seems like a lot) I'm done.
The reality is, the cheapest figure on my list is Superman and I'm afraid the BTTF figures will be over $300 by the time of their release; the Delorean may very well break the $700 mark.
I, too, have been thinking about slowing down with HT. Don't have the courage to fully step away yet. The withdrawal syptoms would be too much when avoiding a figured I would want.
I have five more figures that I know will be made that I want, but as sequels keep being made, I know I'll get sucked back in. For me figures consistently being about $220 will cause me to pause. I'm still good with figs that hover around $200.