R4 to R6 or R7

Morning Group. 
 
One of my customers is currently on R4. Ptf support has long been discontinued 
and soon to be on R5 & R5.5. We are trying to decide from a dollars and cents 
point of view should we go to R6 or R7?
We are just kicking tires here and are only thinking about doing this for 
support mainly for the P/R module. Not going to purchase any additional 
modules. Have not contacted Mapics or affiliate filled out the questionaire for 
R7.. 
 
We have AP, AR, GL, IM, PR, PDM, PCC, PMC, PUR, SA.... 
 
We also have many programs still running in 36 mode. (All in house custom 
stuff) 
 
I know R6 is good and I have no doubt that I can get them to R6 with no 
problems, and the only expense would be my time. 
 
Questions on going to R7 ..............
Is R7 pretty stabile now, especially with only the modules mentioned above? 
Anyone go from R4 to R7 any problems  
How long did the migration take ( This is kind of a broad brush question 
because I realize # of modules, size of files, horsepower all go into this) 
 
Would it be safer to go to R6 then to R7 when they discontinue support for R6 
in 2 - 3 yrs
Will there be any conflict or issues with 36 code and R7
 
Does my 400 need anything? running on a 520... 70 G disk, 1G memory, 500 cpw, 
V5R3
 
Anything I am not thinking about?
 
Thanks in advance
Pete Olshavsky

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