Really for a good experience you just need something with Swank support and ability to highlight matching parens. Eclipse would even work, though I haven't tried any of the plugins for it. IDE features like introspecting values, breakpoints, tracing, profiling, stepping, recompiling are all part of the Common Lisp standard so you'll get them for free just by running the Lisp REPL in a terminal. What you use on top of that is really just making it more convenient to interact with the Lisp environment than typing everything in by hand. I like slimv with its auto-paren-infer stuff turned off (matching and rainbow parens are fine for me) but I've also just used a tool that uses two screen sessions to send data back and forth without using Swank (or even Lisp, I use it sometimes for Python but that's trickier because I can't just send a class to (re)define if I have newlines between methods and I can't casually change my namespace).
Really for a good experience you just need something with Swank support and ability to highlight matching parens. Eclipse would even work, though I haven't tried any of the plugins for it. IDE features like introspecting values, breakpoints, tracing, profiling, stepping, recompiling are all part of the Common Lisp standard so you'll get them for free just by running the Lisp REPL in a terminal. What you use on top of that is really just making it more convenient to interact with the Lisp environment than typing everything in by hand. I like slimv with its auto-paren-infer stuff turned off (matching and rainbow parens are fine for me) but I've also just used a tool that uses two screen sessions to send data back and forth without using Swank (or even Lisp, I use it sometimes for Python but that's trickier because I can't just send a class to (re)define if I have newlines between methods and I can't casually change my namespace).