I always go to my friend's motorbike shop to do the blow(ing) job

2 Options :
1) Compress air can from ACE hardware. costs about RM55. Probably enough to use 3-4 times.
2) Air blower. Costs around rm350 include delivery I think. Look for the 240V version.
http://www.amazon.com/Metro-Vacuum-ED500-5...c/dp/B001J4ZOAW

I have both. I use the blower on the casing. Compress air on the cramped parts like in between heat sinks or when I lazy to bring out all the cables and stepdown transformer.

air blow will spoil the chip sometimes. think about it. i used it 2 times and it spoil my motherboard component at the transistor side. i prefer you buy a external vacuum which is portable 1 and clean it every month. as i do so.

300PSI enough?

too small

I think of finding a vacuum with blower function but not sure about it price abit high and scare unable use lol

Just get any vacuum blower will solve your problem

what about buying an air compressor and put at home? swan brand have oilless air compressor. cost abt RM400+ but that air compressor have plenty of purpose though. not only use it for cleaning ur rig la. can use that to pump water to wash ur car, put nail gun can drive nail, and etc peripheral to buy and use with that air compressor.

maybe u would like to spray paint ur timber cabinet also can. varnishing work