Hard to choose....

[ArwenEvenstar]

I'd bring along:
Gandalf because it's usefull to have an Ishtar
Aragorn becuse he knows the land
Legolas because he'd be useful in forests
Gimli because he'd be useful underground
my best friend Kyle because he's smart...
&possibly my dog because she's a good companion

[Radagast]

I believe the singular is 'Istar' and not 'Ishtar'.
But then again I could be mistaken?