Hello Timmy_C
A decent Video Processor with SDI Inputs can be had for around £1K - though if you want something that incorporates 10-bit processing then your looking at just over £1.5K.
Lumagen, DVDO and Crystalio are firm favourites - the Lumagen VisionHDP (with SDI) being the benchmark the others have to compete with.
Having one of these units Installed and Calibrated certainly ensures your getting the best performance out of your system - though its not mandatory and if you have the patience and a few set-up tools you can go a long way on set-up as a DIY project; then again without proper calibration tools your never going to fully see the benefit of features like an 11 point grey scale adjustment the Lumagen firmware offers you.
If you talk nicely to your dealer you will find they can often offer you a 'second visit' service - you wont pay the full Installation/Calibration fee if you need to get the ISF Technician (magician) back when you rearrange your room.
Best regards
Joe
PS We have a Special Offer on the ColorVision Spyder2PRO Studio for AVForums members - see
ColorVision Spyder2PRO Studio special offer!