If you have to take the 30″ back and keep the MXO, consider this instead:
https://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=222-7315
It has the resolution of an Apple 24″ (full HD+) but is closer to your 30″ in size. Doesn’t require dual-link. Something to think about…..