You can use an IRA at any income level if you aren't covered by a qualified retirement plan, so that's an easy option that works for most people.
I think going the IRA route is better, but as I've explained my blog, you can also use direct real estate investment to get the same tax deferral result--though with more fiddling.
BTW, employers have some simpler less expensive options, too, like SIMPLE-IRAs... which are basically "lite" 401(k) plans. (The actual code section, I think, is 408(p)...) So an employee may want to request some simpler pension alternative from an employer who understandably doesn't want to shoulder the burden of a 401(k).