Sears has this Craftsman 450 piece mechanics tool kit on sale for $199.99 plus $100 back in points ($25 in points every two weeks over eight weeks) -
Craftsman 450 Piece Mechanics Tool Kit [sears.com]
Use the Sears app on your smartphone for 10% off, bringing the price to $180 plus $100 back in points. Stacks with other coupons (thanks RiotPenguin).
There was a coupon in my account that gave me an additional $15 off. YMMV on the $15 coupon, but be sure to check the coupons in your account before ordering. There are definitely some $5 and $10 Sears coupon codes floating around the internet (i.e. - SEARS5OFF50).
Almost half of the 450 pieces are bits and Allen wrenches (215 total), but there are a lot of sockets and wrenches too (207 total). The case is plastic, but I think it's fine if you don't move it around too much. Here are the contents of the set from the Sears listing -
3 quick-release 45 tooth ratchets in 1/4", 3/8" and 1/2" drives
6 extension bars
191 sockets, 6-point, 8-point and 12-point, in both inch and metric sizes
16 combination wrenches
Magnetic handle for easy nut or bit installation
12 nut drivers
175 screwdriver bits
40 hex keys
Includes a 3-drawer case
Here is a link to the contents of the kit with an exact description of each item -
Spec sheet [sears.com]