I will not be able to play until the weekend, so please don't derail the topic. I intend to tweak with some things more and I don't want to see the topic locked, thanks. 
I do like the idea of a sniping GE, it has a lot to recommend it. I just a lot of fun with him using my BBP IX (My Hurricane is at 3, iirc) and triple Overload, good for detonating Snap Freeze and Incendiary Grenades, and the BBP can really dish out the damage if you are accurate.
The Valiant is my favourite, and most used Sniper, it's never a bad choice (It was also my first X UR). I also use the Widow and the Mantis a lot (Shifted more towards Mantis lately). Only Snipers I wish I could use are the Javelin and the Kishock, I love their potential (Especially the Kishock), I just lack consistency with them, and find myself being a sloppy sniper (aiming for bodyshots instead of headshots), which is no fun. Heads must disappear!
I find the BW is just too heavy, and too slow. I either kill them in one shot, and reload, or I curse the refire delay against bosses.
I also see mention of the Incisor, and the Indra, both of which I would rate at pretty much the worst SRs in the game. Incisor being the better of the two (Yes, I said it. I'd rather have an Incisor than an Indra, any day). With enough stabilization, the Incisor is almost good.
If you're playing on Gold, I do recommend trying the Mantis sometime, though without Cloak, you may find the damage a little lacking (Headshots with Phasic Ammo is the only way around it). The overall speed (weight and reload time) are pretty good. The problem is boss DPS, you either have to sacrifice the OSKs vs mooks by using Incendiary Ammo and getting Fire Explosions with Overload, or just kite them and make your teammates kill them. Against mooks of all kinds, the Mantis is pretty rocking.