Still unsure what will work with PMDG 737 ,FDC or Fshotseat

Hi AllI have searched and read heaps of posts, but no conclusion on which program will complement PMDG 737, Flight Deck Companion or Fshotseat, I do not want to loose any realism with regards to aircraft checklists or handling by any limitations imposed by either of these programs which I believe to both be excellent, simply looking for feedback from any body who has used them with PMDG 737, I have never seen such an awesome aircraft as the PMDG models, coupled with the below programs it is sensational Active Weather 2004Active Camera 2004Ultimate traffic 2004Now if only i knew which dam addon to buy either fshotseat or Flight Deck Companion, I am going to study the hell out of the PMDG 737 and then go and do a few hours in a 737-800 full motion sim, although I am a Commercial Pilot with only 400 hours I doubt I will ever fly for an airline so what better than do a few flights in a modern level D sim unfortunately at $1000 an hour, hey its only money I guess cant take it with you, thanks to any respondersRegardsWayne