Which printhead is good for UV printer?

Printheads are the heart of the printer. If the printhead works fine for application then printer is fine.
I examined for the printheads and uv printer applications as listed:

1.Xaar Proton: 35pl printhead which Neolt( www.neolt.it) is using is for roll2 roll paper pritn UV production as entry level is good. But high quality or high speed should not be expected.

2.Konica Minolta 14pl: Most of high quality printers using this printhead like Sun (www.sun-nsk.com) slow but nice print, Gerber, most of chinese, Grapo (www.grapho.com) .. This printhead very nice droplets however speed is limited ,there should be many printhead for printer speed up.It also cost a lot.

3.Ricoh Gen E4: Printhead is very stable with 382 nozzles firing variable dots ,Durst,Gandy Digital,... This printhead have higher speed and finer drops..

4.Seiko 508gs :This printhead is same as Ricoh but it is wider and nice speed.

5.Spectra Polaris :It is high speed but ink drops are not fine enough compare to Konica,Ricoh and Seiko...
I find out Some chinese manufacturer and European manufacturer Eurotechprinters (www.eurotechprinters.com) use this head.