Preamp upgrade ARC LS5, SF Line 3, others?

I'm looking to upgrade my preamp. I have Audio Research LS2 MKII and ARC D200 power amp. The LS 2 can be a little bright on the top end and thinon the low end. I have heard the LS5 and was blown away auditioning it in my home, but have a number of components that are single ended. I've always liked ARC products, but they seem low on features.

I've read reviews on the Sonic Frontiers Line 3 and am encouraged by it. SOmeone I spoke to said the Line 3 was dramatically better than the ARC LS5. Any SF Line 3 owners would like to leave comments on this. Any other preamps one should look into?

thanks

tom