@rojazu hit the nail on the head when he asked about your econ package and overall deck strategy. If your goal is to win an econ war with the runner until you can land tags (and convert the tags into a win condition), then Pop-Up Window, Turnpike, Gutenberg, and resistor are the main ICE you want. Also worth considering are Archangel and to a lesser extent, Tollbooth.
If you need to defend a remote, Tollbooth rises rapidly to one of the best ICE you can include.
If you aren't trying to win an econ war with the runner (i.e. you plan to land tags by 24/7 or Breaking News -> EoI and not by winning a trace) then Pop-Up Window isn't really ICE, it's an econ card, and should compete with Hedge Fund and Sweeps Week for a slot instead.
The one point I disagree with @rojazu on is Information Overload. I don't think it is a particularly good ICE most of the time, but it the right hands it can be used to tremendous effect (see Sol builds by @bakashinobi from about a 6 months ago). The one place where IO is a really, really strong piece of ICE is after landing a big tagstorm via Midseasons when you use it to block a desperation Medium dig. It lands the most complete rig wipes and can often wipe out the runner economy.
In summary, you ICE, like the rest of your deck, will work best when it is considered as part of your wider strategy to win with your deck. If we know more about what your deck is trying to do, and how you intend to win, then we can better suggest ICE that may help support that game plan.