I have used various brands at various times. The big names are Thermo Nicolet, PerkinElmer, Bruker and Varian. I think you will find that hardware is not a differentiator (they all should be excellent), but software differences can be huge. Bruker have been behind the others in software. Get demonstrations before buying. Make sure to spend the money to get a good software library for comparison/look-up. Deomn3's advice is very sound - go for a TIR module so that you can simply press the sample against a surface and press a button for analysis.