It really depends on what you get. A good rule of thumb is to look at the warranty. Generally, higher quality parts will have far more coverage. There's also, of course, user reviews and junk like that.
I wouldn't suggest overclocking. A lot of stuff is made to support it ... but it still violates the warranty, and when it comes to computer parts those are invaluable.
It's really great now, because, most stuff is really well covered, so if there's a problem, you might not even have to deal with New Egg (Though you can, except on specific type of parts).
If you want some advice on what to get in your system, just put up a price range and what you want it to be able to do. (like, $700 USD and Play UT3 completely maxed, for example) Keep in mind, though, when people suggest parts (myself included) there's a lot of bias. A lot of people will suggest things like a Quad core, when there's really no point yet (I've seen this happen in plenty of forums).
How can you dislike overclocking? Well, overclocking is meant to overboost (awesome!) your components so, and companies like eVGA XFX supports third-party cooler swaps, and overclocking in their warranty.
Heck, they can't tell if you've overclocked your parts or not, it's all software. In fact, that's one of the reason they cover it in their warranty, since they can't beat the system, they might as well join it. Doesn't matter to me soon tho lol, I'm gonna do volt mod my GFX once I need a new solder tip
Though OCing is not everyone's cup of tea.