For anyone, like me, that can copy CW at over five words per minute but have a lousy fist, K1EL has a memory keyer kit for sale at http://www.k1el.com. For the sum of $17+Postage US he will deliver, to your mailbox, the kit - ready to build.
This is a much simpler kit than he had a few years back. A soldering iron and a reasonable work space do it. If you are willing to take your time as you build it, this is a good kit.
The K-14 is what you are looking for.K1EL site
Some of the features (see his website for a full list) are:
It requires 6 to 15 volts input but makes a very compact packlage if you use a 9 Volt battery to power it (rated at about one and one-half MONTHS use per battery).