Welcome to the forum.
*EDIT* I'm a tard and thought you were looking for a tourney set, but I see you're looking for a cash set. You can ignore the rest of this. My bad....I need some sleep.
My advice: for a 6-8 player T1000 tournament you will not need T1000 chips and could possibly get away with not having T500 chips as well. I would get some T500s for re-buys though.
I would give out the following chips per player:
10 x T5
14 x T25
6 x T100
You will need the following number of chips:
80 x T5
128 x T25 (112 to start plus 16 to color up the T5s)
80 x T100 (48 to start plus 32 to color up the T100s)
32 x T500 (2 chips per re-buy, 2 re-buys per person)
=========
320 chips total
I would use the following blind structure for your tournament (20 minute levels, 10 minute breaks):
BB/SB
5/10
10/20
15/30
25/50
50/100
75/150
Break and Color-Up
100/200
150/300
200/400
250/500
300/600
400/800
Break and Color-Up
500/1000 (with a maximum of T24,000 in play, the tourney should end here using the 4% rule)
600/1200
800/1600
1000/2000
Just my 2 cents.
p.s. Please double check my math...I've got a bad case of the Mondays.