I saw a very noticable difference when I went from the AC to a Titan Vanessa-L 120. Not massive differences in temp, but in noise- the AC had to run flat out to cool the overclocked pentium D I had, while the Vanessa-L was just ticking over for the same temps. Under orthos they both ended up within a degree or so. The AC's a decent little cooler for what it is but the towers are, for my money, a good bit better. I'm not sure why the AC is still held in such regard, yes it's cheap but then it's only a tenner less than a Thermalright 120. (I've found that the Thermalright with no fan performs about as well as the AC!)
Tuniq Tower's overrated, but then everyone recommends what they have so you should probably take that for granted- it's a good cooler but not anything out of the ordinary really, and its fan is a bit rackety at speed.
Lots of good choices these days tbh.