i used to have a white projector, and it never made any difference for me. it was mounted above/behind my last row of seating, and my roof was white though, haha.
you could always build a 'hush box' or something to hide it. but when you end up spending more to hide/cover it, maybe the 6020 or a jvc makes more sense. pay for performance or extra bulbs instead of cosmetic fixes.
i don't know what prices you've been quoted, but the best i found for the 5020 and x35 had the jvc being 500bux more expensive, but it came with an extra bulb, 3D emitter, and 2 pairs of glasses. i figured that made it really only about 200bux more, if i figured the bulb was worth 300(the epson came with glasses too, so i put no value on those)
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC, PS3, XBOX360, Wii
Control: Harmony One