Do you have either the 2.5 oz Climashield or the 1.8 oz primaloft sport on hand?
Unless you know a supplier who still has some I do not think the 2.5 oz Climashield is available anymore.
I used the 3.7 oz Climashield Combat with .9 oz Intrepid in my 35 degree top quilt and used no quilting at all.
Below is some info copied and pasted from OWFInc's website.
Climashield Polyester Continuous Filament: (From the makers of Polarguard)
Continuous filament insulations stretch, are warm even if wet, can be washed, are naturally durable, and don't require a scrim or quilting in manufacturing.
CS 3.3 HL 73" 3.3 oz 1/2-1" loft white
CS 6.0 HL 64" 6.0 oz 1-2" loft white
CS 9.4 HL 60" 9.4 oz 2-3" loft white
CS 11.7 HL 60" 11.7 oz 2-3 1/2" loft white
Next is some info copied and pasted from MLD's website.
New for 2010
ClimaShield APEX is the most thermally efficient synthetic quilt insulation avialable. It drapes, compresses and recovers very well and Does Not Requiring Through Stitching- that eliminates sewn through areas and prevents cold spots. Many other synthetic insulations require sewing of the insulation to the bag shell (you can see the many horizontal seams on the outside and/or inside of the shell) to prevent shifting or tearing. Apex is a modern continuous long staple type of insulation and does not need quilting in this type quilt and retains all of it's thermal clo value. - Some synthetic insulations made for small panels in clothing that that test good clo ratings loose much of that thermal efficiency by quilting to stabilized the fragile insulation matrix - Sewn through insulations generally can not recover as well to multiple tight compressions over time.
Now just to confuse the issue here is some info copied and pasted from Thru-Hiker's site.
2.5 oz/sq yd Climashield APEX
Climashield APEX continuous filament insulation is a great choice when you want something highly durable, efficient, and easy to work with. It excells in applications having large panels such as a quilt because it does not require much quilting.
Personally I would go with the 2.5 oz Apex and no quilting. I used the Intrepid .9 oz breathable nylon from OWFInc. and was very pleased with it. The 2.5 APEX Spirit Quilt on MLD's website is rated at 45 degrees.
Your finished weight could be as low as 19 to 24 ounces. 84" x 60" is a fairly large quilt.
Good luck with your quilt.