If you enjoy building, Sig kits are among the best, especially for beginning builders. You will find it a lot easier to build your LT-40 than a stick and tissue kit. I thought that stick and tissue kits would be good practice for building my Four Star - I think it was actually the other way around.

If you aren't in a hurry to get in the air, and you aren't overly concerned about the price, then you can't do any better than the LT-40 kit. There are plenty of build threads here (especially RCKen's) that will give you all the help you need. Read through them a couple of times and decide which improvements you want to make before you start. If you start with the attitude that you are building it so that your grandkids will fly it, then I'm sure you will do a great job.

Good luck.