Cool:)
Yeah I think splitting the rating up the way you two did it would work better.
Although I think the price might need to be increased, at least for the higher rating ones. Otherwise a Rating 12 über Host would only cost 720K to acquire. Thats less than a Fairlight paladin cyberdeck. :/ a rating 12 host would be something nigh unreachable like multi-million cruisers etc.
So maybe something like this:
Host (Rating 1-4) availability = Rating*3 Cost= (Rating*Rating)*5,000
Host (Rating 5-8) availability = Rating*3 Cost= (Rating*Rating)*8,000
Host (Rating 9-12) availability = rating*3 Cost=(rating*Rating)*20,000
This would give us something like:
R1 avail 3 Cost 5K
R2 avail 6 Cost 20K
R3 avail 9 Cost 45K
R4 avail 12 Cost 80K
R5 avail 15R Cost 200K
R6 avail 18R Cost 288K
R7 avail 21R Cost 392K
R8 avail 24R Cost 512K
R9 avail 27R Cost 1,620K
R10 avail 30R Cost 2,000K
R11 avail 33R Cost 2,420K
R12 avail 36R Cost 2,880K
Im inclined to increase the 9-12 hosts even more in cost and make them F, but then again I doubt any of my players would get their hands on one of those anyway.
Regarding ICs Im thinking something like this:
Patrol avail 6 Cost 5K
Track avail 9R Cost 10K
Bloodhound avail 12R Cost 15K
Acid avail 12R Cost 20K
Binder avail 12R Cost 20K
Jammer avail 12R Cost 20K
Marker avail 12R Cost 20K
Shocker avail 12R Cost 20K
Scramble avail 12R Cost 20K
Probe avail 12R Cost 20K
Crash avail 12R Cost 20K
Tar baby avail 15F Cost 30K
Killer avail 18F Cost 50K
Catapult avail 18F Cost 80K
Sparky avail 18F Cost 50K
Blaster avail 18F Cost 70K
Black IC avail 21F Cost 100K
@Jack_Spade I think I would lower the maintenance cost, otherwise a host would cost more to run for a year than it would cost to buy it in the first place.
Maybe 2% of Host+IC? that would still be 4k each month for a R5 Host with no IC on it.
If one of the Freelancers working on the Technomancer book is reading this: Private Host rules would be really, really appreciated 
agreed