Well it depends in which server you are...
I'd say between 1,5M - 2M, cause I bought (in Oasis server of course) :
- lvl 35+3 glaive crit5 : 800k (IMO it's worth at least 1M...)
- lvl 42+3 glaive crit11 : 2M (still a nice price I think, cause the crit is nice)
Maybe you could try more than 2M, cause most people are looking for that nice purple glow...
Good luck selling your stuff...
EDIT :

I didn't notice the +1 str, so I'd say definately 2M or more...