If you are new to electric flight, you might find this useful:

Everything you wanted to know about electric flight
http://www.rcuniverse.com/forum/m_7100376/tm.htm

You might get more responses in the Electric Aircraft forum or the glider forum. This forum is primarily for glow pilots which is why you are getting interest in your motors, but no real useful answers to your question. Let me see if I can help.

I would need to know their current all up weight, but I will take some guesses.

A Gentle Lady is typically between 25 an 28 ounces, all up flying weight without a motor. Let's target 32 ounces, 2 pounds, with a moto. When sizing electric power systems we usually use watts/pound to size the systems.

I am going to suggest you use a brushless outrunner type motor since it looks like you would just bolt it to the pylon, or attach it to the nose and get rid of the pylon.

Not sure what kind of rate of climb you want but I am going to suggest about 60 to 80 watts per pound. That should get you to about 600 feet in about 20 seconds. So that would translate to about a a 120 to 160 watt motor, more or less.

If you are going to put it on the pylon, I need to know the clearence. Gliders like big, slower turning props that fold. Would shoot for an 8 to 10 inch folding prop for that plane using a brushless outrunner of about 800 to 1000 KV rating. I would want the ESC to have a brake to stop the prop from spinning.

If you can provide the info I requested, maybe I can help.

As a first cut, this combination looks reasonable - I would put this on the nose and replace the fixed prop included with a folding prop.
http://www.maxxprod.com/mpi/pdf/combo-061-10-15.pdf

I love this lipo charger because it is so simple and so safe to use.
http://www.fmadirect.com/detail.htm?item=2218§ion=45

This pack would work
http://www.fmadirect.com/detail.htm?item=2269§ion=69

Now, this is a first cut which which needs to be tuned based on information from you. But it is a first blush. There are cheaper parts, chargers and batteries, but these are good quality parts that should serve you well. And the charger is a very popular charger among electric flyers. I have one.

If you put the motor on the nose, you can remove lead used to balance the plane and maybe come out the same or lighter overall.

We would have to judege if the battery would fit in the fuselage. Packs come in various shapes.

If you have battery packs you want to use, you did not mention it.

Feedback needed and more info please.