when I was deciding between a A1200 Tower and an A4000, I eventually chose the A4k because it had Zorro slots 'built in' and was there more suited to expansion.
However, I found cards expensive and very rare to upgrade with (PPC/060) so I wish I'd have gone for the A1200. Also my A4k clock has bust now cos of a battery leak.
So I'd keep the A1200.