A4000T PSU - 250W enough?

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I am beginning to wonder whether the standard 250W PSU in the A4000T is enough for me.
I run it with three hard-disks and a CD-writer internally, and then the Cyberstorm has 128mb on it. There are two extra fans: one on the 060 and another backplane cooling fan.

So, should I get something better, like 300W or 350W?
What would happen if I added a fully-loaded DKB3128 board?
Has anyone ever changed their A4000 PSU?

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Thanks for the advice, guys..


@ Bill: could you please tell me the model number of that Fortron PSU?
I assume I should be able to get it anywhere.