It is very hard to give a advice with so little facts. It is like going to a car dealer and ask for the minimum car engine to get the optimal functioning of transport.... The car dealer would smile and then ask you a lot of questions to see what your requirements are.
How many users? How many applications? What is the footprint of each application? How many simultaneous users? How complicated are the load scripts for each application? etc etc...
Qlik has a spreadsheet and a QlikView Application to help determine and calculate something that can give you an indication on how to spec a server.
