Just for the record, my battery is SECURLY attached, and will not fly off unless a severe impact occurs, and that is no different than if it's in front!
Uhh, Also, I dont consider this an performance mod, but a convienience, longevity mod, as the battery suffers far less heat sitting in the trunk, than sitting on top of an overheated tranny, and next to a overworked head/waterpump.

Seriously, I expect to significantly increase the battery life, and when it does die, I can put whaterver the heck I want in to replace it, and dont have to worry about what "group" it is.

Just buy the cheapest one with a good crank rating

Seriously, I would reccomend that orbital dry battery, but it's not really critical in my opinion.
Also, theres no difference between putting it in a cheap plastic box, and putting it in nothing. If your going to box it, put it in a real racing box, not that thin plasctic crap they sell at pep boys/autozone.
And on a nother thing, I think in general it is easier to get to the batter in the trunk to jump it, since a car can pull up behind you and you can just connect it, dont have to turn a car going the other way and face hood to hood.
just my $0.02