Hey a grand is a grand especially if it's mostly profit.
With that said, this is what I would ask myself:
Do I have plans to develop?
What is vlogs.mobi doing right now?
Do I need the money?
Will I kick myself in one year for selling the domain too low and/or not having the domain anymore.
I own Videoblogs.mobi. I would sell for minimum of $1000 and would probably not sell until $2000.
Vlog.mobi is a better name by a few hundred I would say.
Also, Videoblog.mobi is a premium name. If that goes for BIG bucks, the buyer will most likely pay you well for vlog.mobi
Good luck. Keep us posted.