It is much harder for me to find a startup that pays as well as a more traditional IT shop would pay me. I can find a 130-140k job in .NET here in South Florida with relative ease. For open source, there are maybe a handful of companies willing to pay that kind of money. In general, these enterprise places will offer very good benefits (vacation/401k w contribution/paid healthcare) and the work is not hard in comparison.
At startups, its just spottier. Last place I worked paid me same as before but didn't contribute towards my healthcare.. That was an extra $1300 / month that had to come out of my paycheck and an expensive lesson.
I've yet to come across someone who has been "happy" with their benefits package. I don't even take advantage of mine because it's such a large chunk for a single person, and yields no incentives - these I would likely consider tangible benefits (aside from the obvious). I could see it being nice if I had a family though, but most people I've spoken to use their significant others benefits package.
The one thing I hope to always have wherever I work is flexible working hours. I very much dislike the stigma of "oh you're not first into the office!". Maybe it's just me though who has ran into this.