Yeah, all depends on what you're going for. Depends whether you want budget - as cheap as possible - or whether you want to invest in something that's better quality that you'll be happier with and will last longer. If you want it to be reliable, quiet, good, etc. then you have to up the price a bit (although not too much...) and get better-quality components.
For example, the difference between a 60€ and a 80€ mobo can be astronomical in terms of quality/reliability, even if the features are practically identical.
Sometimes intuition can lead you astray too... For example, should you have a 550W gold-certified PSU or a 750W bronze-certified one, both of which come from the same manufacturer and are the same price? Surely a 750W one is better, right? Answer: no, not necessarily! Chances are you'd be better off with the 550W one (which would generally be cooler, quieter, and draw less power) unless you planned on having >1 GPU in future, or planned on doing some serious overvolting. All of these things have to be thought about when deciding which components to get (unless you don't care that much).
Depends what you want from your PC, and how much cash you're willing to throw at it. If you don't care about quality & noise then that will save you some pennies...