Here's a nice cut & sew V neck method that may be used on any vest

The new Shawl Collar Vest pattern includes 16 pages. Ribbing can be knitted as the beginning or as afterthought ribbing. The newly added shawl collar vest pattern includes a schematic for drawing your own charting device pattern. This will allow you to knit the vest in any gauge. There are also 2 diagrams with stitch and row counts and decreases noted for those who prefer to knit from diagrammed instructions.

Vests with Men in Mind is a collection of 6 machine knitted vests. They are "with men in mind" because vests have been the knitted garment most frequently enjoyed by the men in my life. In fact, the patterns are unisex and look very nice on women, too. Here is the table of contents which includes sizing, machine & gauge information:
TABLE OF CONTENTS:
Basic vest in Red Heart Super Saver for bulky machines. Shaped neckline. Finished chest 41-51.5
Cabled Classic in Jaggerspun wool blend for standard machines. Shaped neckline. Finished chest 38-43
Sideways Vest in Tamm Sport for standard machines. Shaped Neckline. Finished chest 38-50
(Not) Fairisle Vest in self-patterning worsted weight yarn for bulky machines. Cut & Sew neckline. Finished chest 36-51.3
Tuck Vest in Herrschner’s Big Ball for bulky, mid-gauge and standard machines. Cut & Sew Neckline. Finished chest sizes 40-56
The Shawl Collar Vest in 2 lengths, 2 gauges and 9 sizes for any bulky machine is now included in Vests With Men in Mind. It is a separate file. Be sure to download both book files.

None of these designs requires a ribber but having one may be helpful for some of them. $14.99

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The newly added shawl collar vest pattern includes a schematic for drawing your own charting device pattern. This will allow you to knit the vest in any gauge. There are also 2 diagrams with stitch and row counts and decreases noted for those who prefer to knit from diagrammed instructions.