SE was commonly associated with sport packages in the 80s and early 90's, then the denotation sorta went away. It has come back over the last few years in cars and other products as the "best looking base model". I don't think NVIDIA is really deviating from that, as it has more SPs than a 450, and higher bandwidth memory interface than the GTX 460 768.
What should determine this card's worth(lessness?) is a good but short set of gaming and synthetic benchmarks of:
460 SE @ stock and overclocked
vs
4501ghz core speed (a couple models have this BIG OC stock
vs
460 768 @ stock and overclocked
vs
460 1gb and/or 465 @ stock
vs
HD 5770 and/or 5830 @ stock
... pair the performance up with the price and see where it sits. The bandwidth and/or the overclocking could very well make this an awesome entry-level SLI setup, and a great 1680x1050 + 2xAA and gratuitous tessellation setup in single card setups.