Hopefully this weekend I'll have the comparison of DPI vs UK posted. I prefer DPI, it is just a better built system overall. The only thing that I really liked compared to DPI was the UK exhaust tips, not that DPI is bad, I just preferred the look of the UK one however I can live without it.
Also remember if you do get a UK system and you do have a problem with it, you'll likely get no where even with a "transferable lifetime warranty" like I did. I am still stuck with a rusty UK system laying around my garage that they admitted was from their "worn formers" and still don't want to do anything about it.