@Gill, I've listened (quite a bit) to a 12" ID and it sounded really good! A really good sub for SQ applications. I've not listened to an 8" ID (or IDQ). Haven't listened to a 10" ID either, but the 10" IDQs are awesome.
An 8" will be really good without being boomy, but I personally feel the 10" would be better. Simply because the 10" would go deeper and lower than the 8". And this being an ID we're talking about, you don't really have to worry at all about it being boomy. If you go for the smallest spec box (0.8 cu.ft. I think), the bass will be quite tight and defined and will not be boomy or loose.
The ES250 is also a good sub. I've not listened to the 250, but I have listened to the ES300, and found it to be really good.
Personally, for SQ application, I'd choose the ID V3. 10" over the ES250 any day.
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