I puchase, and for the most part, design with parts exclusively from 
Mouser, and as a second option DigiKey.

Mouser always upgrades $300.00 or above orders shipped domestically to 
2nd day air (just select UPS ground at checkout time).  If they miss 
shipping it and you ordered it before the deadline, they will ship it 
the next day, next day air, for no additional charge.

Mouser's sales reps will insert scheduled orders, at the lower rate, for 
large purchases.  For instance, I use Qty 50 of a part with a long lead 
time, and is rather expensive ($12/each), every month.   So I inserted a 
Qty 500 order, to be delivered 50 at a time.  At the qty 500 price.   A 
lot of my long-lead-time, but high-individual-priced parts are being 
done that way.

Digikey just isn't as nice to work with for me.   I don't like the 
website as well, and truthfully, if Mouser would start handling National 
Semiconductor parts, I probably wouldn't order but once or twice a year 
from digikey.

All of the others are only ordered from once in a while, if I need 
something they have stock of.   About the only exception is Allied who I 
buy some din rail mounting stuff from on a pretty regular basis.  But 
for regular semiconductors, I go Mouser all the way.

Just for reference, I probably do around $5K-$10K of parts orders a 
month, and probably 90% mouser.

-forest
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