I have up until recently run a compressor without a tank with no problems at all. I've now upgraded to a much bigger compressor with a tank, but thats to run my vac-former
If your really fussy about fine detail, then go with one with a tank. If you're not that bothered and want it cheap as poss then the tank in the 1st link is ideal. In fact I have one just like that for sale
but much cheaper ....
PM me if you do decide to go that route ....