Lisp purists will probably slam me for this (with adequate justification) but I prefer the modern Lisp ecosystem with:
* both free/open source and commercial Lisp environments
* free deployment using open source systems like SBCL, etc. (In ancient history, I only used my 1108 for marketing prototypes and research because there was no reasonably priced deployment strategy)
* when I do want a persistent heap setup, I use SBCL and dump new images as I work. I don't often use this mode unless I have a lot of data that I am using over a long period of time - otherwise reloading source at the beginning of each work session is OK.
* emacs + slime is a good environment
If you want image based development, I would suggest that you try Squeak Smalltalk (liberal open source license) or Cincom Smalltalk (modest cost, good support and features, and a good deployment strategy). I think that using Cincom is totally free until you start making money with it.