Its all about what you, and the next guy is willing to pay. Its my belief (right now) that you cannot find anything worthy of having for less than 400. At that price it won't be a Smith for certain, here in my area. Not to say that you can't find a good deal, they are out there if you look around.
I passed on a 2.75" Security Six about this time last year. It was priced at 300. Just last week I saw another one that was priced to me for 400 OTD. Its in tthe safe, I plan on firing it today. Its going to be in the 70's - Hot Dayum!
But in my opinion 450 is a bit pricey, for that model and brand.