Webdesign advice

[Ashen]

Well, nisi is a legal term of something I can't remember.

nisi, in the legal sense, I think means temporary, subject to change, not finalised (as in a decree nisi which may still be altered, as opposed to a decree absolute).
Which might be fitting if you plan to update a lot, or might just be confusing for any legal-types who find the site accidentally.

Is there a reason you decided again your full name (e.g. Nikolas-Sideris.com)? If not, I think it could work. If you're definately against it, Nik-Sid.com sounds better to me.

(On an unrelated note: I have a domain I don't know what to do with. Seemed like a godd idea at the time, but now I'm reluctant to use it...)

[Sean]

Music is never constant and it always changes perhaps Nisi represents that well?

I prefer your full name though to be honest. NiSi sounds a bit 'forced'. Really up to you though, your music kicks ass so what does the name matter?