I was always a massive X Com fan and thought the reboot on the 360 was superb. Had the update - Enemy Within for a couple of years and it's still, hands down, the most addictive game I have ever played. The 360 is battered, broken and the disc drive doesn't work but the One I bought to replace it only gets used half the time because I'd downloaded EW and it doesn't need a disc. If you're a fan of top-down, turn based stuff then it's a no-brainer.
I was a massive fan of the first one when it came out 21 years ago! Didn't really like the underwater one, but the new one is very fun. Just bought it for pc with all the addons for something like 2.99 in a one day sale.