Spacers and shocks is the cheapest, but springs are not really that much more expensive than the spacers when compared to the shocks.... I tried the Mopar 2 inch coils but have found them to stiff (in the 2 door petrol). Apart from that it is advised they can be used with the stock shocks - wrong... only 30mm remaining travel
On top of that, you really need to lengthen both front and rear sway bar links and maybe extend the bump stops (depends on the shocks/coils used, over 2 inch its starting to get close, over 3 inch its definatley needed)