I like the second one, if you add up a little personal close, like "we'll miss your company along". the 4th one is equally right. It's true what KG says, that this is not about what one may want, but if it was me, i would like not to hear long phrases... i'm not much good with words myself.
for the whreat, (sorry the linking system is generic)
i would say , at http://www.uksflorist.co.uk
Pink and White Wreath - (C29)
it's the least depressive i could find.