Tool girl reporting for duty (even though I have nothing that could resemble a garage in any universe).

YES on the cordless drill! I use it all the time. I've found the fairly smaller ones are actually more useful than a big one--they're too heavy and the grip is too large for my hand, so I don't use it. Plus, any job that needs that level of power, is likely beyond me anyway. It's not like I'm building houses! Try them out in person to find one that feels comfortable, even if you buy it on-line. I've found that 20v is the most powerful I'll ever need. Plus, lithium batteries bigger than 20v get heavy. I would avoid Black & Decker and Craftsman tools across the board; I've never had one that didn't break or die.

I like this one: Dewalt DCD795D2 20v Hammer-Drill Kit. Makita are lighter and better sized to my hand, but they only do 18v (not a problem for power, but can be difficult for battery availability) and they're astonishingly expensive. But they are sweet. Look for brushless motors on everything--they function better and last a lot longer.

And I would pick up a palm sized cordless screwdriver--cheap (@$15) and found everywhere--for little tasks like hanging window hardware, hanging pictures, etc. I've actually been able to use it for hanging my mailbox, installing solar fence post lights and stuff like that, too. Get one that has two positions--straight and 90* because it's handy in tight corners.

For yard work stuff, I love the Greenworks line on the G-Max battery platform. I switch out 40v and 20v depending on the tool and the weight. The mower I use 40v because it's self-propelled, but the trimmer and pole saw, I use the 20v or it's too heavy for me. I don't have good upper body strength. The pole saw is basically a small chainsaw on an adjustable pole and very, very useful beyond tree pruning. I had to level the bottoms of my fence gates because they were catching, and it worked great. The company is really good to work with, too, for CS.

Plus, what Una said! And a paint scraper (stainless), and a ratchet wrench that has super short handles--like the whole thing is @ 5" long--for using one-handed in tight spaces. Probably more, but I can't think just now. Oh--a Dremel sander that can also accept all sorts of attachments as needed. Hand sanding is painful!

The only thing I cannot find is a caulk gun that I can load and use without killing my hands.