Celeron G1620 vs Pentium G860 vs G2120

I am starting to see a lot of builds around Intel's Pentium G2020/2120, and also noticed that Newegg now has a line of Ivy Bridge Celeron CPUs, G1610/G1620. The Celeron's seem like an amazing deal at only $50-$60, even cheaper than the Sandy Bridge Pentium G860, and rated at only 55W. The G2129 is the most expensive but still a good deal at almost $100.

I have a recent HTPC build around a G540 and I'm very happy with it.

I am thinking about one of these for a simple home office build, no gaming, just web surfing, some light music and DVD encoding, and Open Office applications. Anyone here having good experience with the G1610/20 for this type of build? What would be the benefit of going up to G860 or G2120?

Thanks!