I was favouring ever the LaCie Rugged 1 tb or the G tech 1tb. I have heard good things about the G tech, the LaCie rugged might be safer around my children. Not sure, also if I sell my mid 2010 15" MBP will it still be possible to use the LaCie rugged or Gtech on the 2012 MBP, or would I need to upgrade to USB 3 or thunderbolt?
(a) No one but insiders knows the specs of the 2012 MBP's. A USB 3.0 port seems very likely. USB 3.0 is backwards compatible with USB 2.0, so a Lacie or Gtech or other drive would still work at the slower USB 2.0 speeds.
Most portable Firewire drives are multi-interface and include USB 2.0.
(b) My guess (and guess only) is that the new 2012 high end (15 & 17 inch) models will keep a FW 800 port. Although they did it with the MacBook Air's, it seems too much even for Apple to discard two major legacy things-optical drive & Firewire. A "Pro" model is supposed to be versatile. Retaining Firewire would not add much space or weight. "Power" users who still have FW peripherals will want to keep using them.
Also, the Thunderbolt (TB) transition has been very slow. There are not many device options and the cables are expensive. Eliminating FW would push some users to USB 3.0 devices (cheaper & wider availability) at a time when Apple would like to see TB take off.
(c) I really like Firewire. If there's plenty of cash, by all means get a nice Lacie or Gtech or Wiebetech or other good quality portable FW/USB 2.0 drive. But...
understand it's a transitional time. USB 3.0 will be generally faster than FW. It will be good enough in the near term for non-intensive data transfer uses.
Portable enclosures with Firewire + USB 2.0 are priced higher (roughly $40 more) than
USB 3.0 enclosures without FW. Portables with FW &
USB 3.0 are very hard to find.
If you are moving to a 2012 MBP soon, you'll pay a premium for FW, slower than the updated USB 3.0.
[You can find many analyses of performance. Here's one:
http://barefeats.com/hard145.html ]
For someone on a budget, I'd suggest to either or both:
(i)get a USB3.0 enclosure/drive and make do in the short term with USB 2.0 speeds
or
(ii) Buy a less expensive FW400/USB 2.0 drive as a transition. I've used Lacie Rugged, Gtech and MacAlly portables. I find the MacAlly enclosures pretty good & have certainly dropped & bumped them repeatedly with the drive being preserved. (You'd need a FW800 to FW400 cable, just a few dollars at Monoprice)
The MacAlly PHRS 250cc [FW & USB 2.0]is useful and much cheaper ($40 to $80 less) than the Lacie Rugged/ Gtech/Wiebetech. You would have to buy a hard drive separately & slip it in. However, you have more choice of the price, speed and quality of the hard drive.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817347013
You could get both USB3.0 & MacAlly FW enclosures and add budget HD's for only a bit more than the price of a Lacie Rugged.
(d) Eventually, there will be Thunderbolt hubs that can handle USB, FW, & eSata as well as TB. But there's no device with all these capabilities on the market now, and low prospect of such a device plus cables being cheap within a year or two.