what u need is usualy 2 things
for a normal s/box user start with 10 private
proxies - you use these for posting only.
for scraping you always use public proxies > why ?
Just do a little test and take 100000 keywords, use 10 private
proxies and start harvesting. After a while SB will come to a grinding halt.
Google blocked your proxies...
Eventually they will clear again but all this time you can't continue
with your project. So for massive harvesting with large keyword lists
you will need hundreds of proxies. Not funny when 20 proxies cost
you about $50 a month. Or 10 costing 20-25$
the above reason is generally why using 10 proxies to post and harvest
is a bad idea, because lets say u only have 10 private proxies u can
end up with your proxies banned for 2/3hrs for to much scraping then
u cant post either.
so general rule of thumb
start with 10 private proxies for posting for 1 month as a test
if its not enough, at the end of month 1 goto 20 this will cost
u between 40-50$ a month for 20 --- 20-25$ for 10
and use your public proxies only for scraping
ps evryone will say there the best at something, maybe they are
maybe there not, my advice is read through the users advertising
scrapebox proxies in proxies for sale
http://www.blackhatworld.com/blackhat-seo/f112-proxies-sale/
read the sales intro which is always post 1 - read feedback left
by bueyrs - read there itrader - then decide
your new at this so jump on the first ship - read a little