Tank room electrical DIY: subpanel or no subpanel?

[Delphinus]

Anyone have any thoughts on whether to, or whether not to, install an electrical subpanel in a tank room?

For the sake of convenience, I'm tempted to run a 220line from my main breaker to the tank room (which isn't yet built, only just a twinkle in my eye at this point). The reason being that where the tank room will reside and the electrical panel are not really that close to one another.

I spoke to an electrician a while ago about this, and he suggested I not bother, because my main breaker panel "had lots of room in it". The problem I have with that is I'd have to run a line for every circuit in the tank room from one end of the basement to the other. Not really a big deal I guess, but if the rest of the basement eventually gets developed then it becomes a bigger deal to run a new line if needed. Whereas with a localized panel there is more flexibility, and the option might even be there to run some devices at 220 instead of 110 (I'm not sure if there's an advantage to that, but some pumps and some ballasts can be run at 220).

So my thoughts are, it's a good idea to have the subpanel. Are there any reasons not to (besides cost of the panel and so on)?