did you go with the 21" or the 18"?

 

Take it to a Kragen Auto parts, they take used oil at no charge...

 

I think I have the 21.
You may want to look to see if there's something better than that. The drain plug in the middle of the pan doesn't screw tight on mine. I used to have a drain pan much like this one but the drain hole had a large cap on it and the pan itself screwed into the hole for use and when not in used snapped tightly into where the drain is on the above illustration.
...but my roommate threw that one away

I might have gotten the one plug that doesn't work anymore but it's still definitely worth trying out before you buy - I mean unscrewing and screwing the plug to make sure you can get a seal and it doesn't do one of those gets tight then skips the tread and you have to tighten again.

 

I do mine from the bottom. I don't even need to jack it up, now that I'm lifted. But in regards to getting it off, I don't need a wrench. I always use the FRAM Sure-Grip (or something like that) - the top of the filter is covered in a grippy material that doesn't get slick. Makes it 100 times easier.

 

Reaching in through the flap in the Driver's side wheel well is the only way to get a straight shot at the filter. Filters should only be on hand-tight anyways (I do turn it as absolutely as tight as I can by hand). If you've dipped the seal on the oil filter in oil, as you're supposed to, the seal will swell a bit and assure that you've gotten a good seal. Next time you change you're oil, no need for a wrench, just have to work it off with your hands.