150 vs 130+/- vs 100+/-
I have an E36RH with a furler in Annapolis. We have 0 - 10 kts most of the time here on the Chesapeake. The E36RH is a little lighter (with less weight in the ends) and has a slightly taller mast height. The sail area is about the same as the E34. The E34 has a longer J and slightly bigger headsails. I have 150% on the furler most of the time. My next smaller sail is a #3 (103%). These two sails cover the wind range from 2 - 20 kts with an overlap in the 10 - 15 kt range. Quantum built my 150 with a light air shape, but with enough load fiber for 17 kts so that it could be used partially furled if I have to. It's fully powered up at 12 kts and I'm de-powering the sail plan above that. My #3 is built to power up in lower winds in order to give it a wider range. Quantum designed both sails knowing I wanted to cover 0 - 20 kts with two sails with as big an overlap a possible. Both of these sails are Fusion M composite material, not Dacron.
I decided to go with two sails (150 and 103) vs a single sail in the 130 -140% range for the following reasons: I hate the sailing shape of a partially furled headsail. With typical winds of 0 - 10, I wanted the extra area of the 150 as my primary Summer headsail. I mostly day sail, and I like sailing in light air, so I wanted to be able to sail as much as possible when I go out. I like sailing upwind and the E36RH points really well. I wanted to have a smaller, heavier built sail to use in higher winds vs pushing a partially furled 130 - 140 past it's wind range. I like to have a backup jib. Reaching and running are faster with the bigger jib unless you are using an Assym or cruising Spin.
The downsides to this setup are: Changing headsails is hard. The 150 is big and heavy. I can't fold the #1 or the #3 on the boat. I try to change headsails at the dock. If I'm out sailing and have to change headsails, I lash the unused sail down on deck and deal with it back at the dock. I have to store the unused jib onboard. I had to buy two sails vs one.
If I had to do it again I would still buy two sails. The 150 gets the boat sailing in any wind over 2 kts. I rarely need the #3 in the Summer and I almost never sail the 150 partially furled. I usually switch to the #3 in the Fall on the first windy (15 kt) sail and leave it on through the Spring with a few changes up to the 150 if its light and I'm motivated. The boat needs 5 kts to get moving (barely) with the #3 and sails OK in over 10 kts.
If you consistently have at least 5 kts and less than 15 kts and/or you prefer to motor in light winds, then I would consider the benefits of the single 140 (cheaper, no sail changes, no storage). Also consider this if you don't want to deal with sail changes.
If you have 0 - 10 often and roll up and motor if it goes above 15 than a 150 will work well.
If you sail in 10 kts or more and plan to use an asymmetric for reaching and running, than a 90 - 110 will work well.
Just some ideas.
Mark