Dart 318 Header opinion

Hi guys,

I have a 318 Mopar with Crower cam http://www.crower.com/camshafts/mopar-273-360-la-pro-street-solid-cam-278-fdp.html, 9:1 cr, 650 mec carb, Weiand X-cel intake, ported heads with stock valve sizes, 4 speed.
I'm choosing between the Headman tight tube or Dougs D453-R headers, long tube header are out of question - I live in Brazil and need a good clearance to the ground.
If someone coud help me, I need to know if the Headman tight tube will hurt the performance, because the small diameter tubes/short tubes? Or must I have choose the Dougs - do you think the difference in peak HPs make it worth the Dougs highest price?

thanks!