I would say definitely do not get the Sweetwater Creation Station. Its all a marketing ploy "audio grade ram"
ha ha, ok. Last time i checked only the Flagship Creation Station has a dedicated video card, and the rest were Internal Graphics.
Im going against the grain here and will recommend you try the Dell. I usually say stay away from Dell, BUT, the one you mentioned looks to be pretty good. Just make sure there is a 30 day (or longer) return policy, just in case you have problems.
Have you considered building your own PC? That would still be my number 1 suggestion. That way you have complete control over every component used