A better configuration to do development? currently I have a mac mini:


  Hardware Overview :
  
  Model Name: Mac mini
  Model Identifier: Macmini2,1
  Processor Name:   Intel Core 2 Duo
  Processor Speed:  1,83 GHz
  Number Of Processor:  1
  Total Number Of Core: 2
  L2 Cache: 2 Mo
  Memory:   1 Go
  Bus Speed:    667 MHz


Basically it is a 2 years old mac mini.

I installed XCode 4 recently. I want to leave Xcode 3 aside. And I am fed up with the slowness of that setup! What is your own experience of a configuration suitable to perform development with Xcode 4?

To give you an idea of my budget, I am considering buying a 27" quad core iMac.
The iMac you are considering will be much faster than your mini. One tip I have is to upgrade your RAM, Xcode will use it.