I don't think I've seen any that I'd put above Samson, but again - I don't even have an arch, so consider the source.

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Some folks also have them custom fabricated. Check out Mark HB's custom arch from Fishing Boats Unlimited.
http://www.boatingabc.com/forums/ubbthr ... 618/2.htmlHere's the fabrication shop that makes some of Cobalt's arches; that's a Cobalt arch in progress sitting out in front (possibly for a 272?). I can try to get their phone number but I doubt they'd be able to do anything for you. They're not a "tower manufacturer," they're a fabricator with the skills & equipment to make arches. Never hurts to call though.

Monster seems to be another well made tower, but the style isn't everyone's cup of tea.