I'm wanting to order a 40 degree ghost pepper topquilt and I want it to be as lite as possible and have a few questions

1.) I'm 5' 2" and I want the quilt to go to my neck I'm thinking of going with a 65in one instead of the 70" one like my hammock gear topquilts, would this be too short for me?

2.) is the a reason to go with the argon 90 over the argon 67 for the outer shell?

3.) not sure what the taper is on the hammock gear burrow is (just says full taper) but the taper is fine on the burrow....should I go with the 10in or 5in taper?

thanks