I'm looking for something that can be purchased on the net. I don't so much care about the learning curve of the deck, or the cost. I just want something that is proven to be successful. I sold my cards years ago, and want to jump back in without a huge investment.
closed as too localized by Dave DuPlantis, Alex P, David Zaslavsky, Pat Ludwig♦ Dec 17 '11 at 6:17
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I think that depends on the level you want to "buy into" (I didn't quite understand your criteria, so this is a shotgun answer).
If you're looking for an inexpensive way to have some fun with a fairly laid-back budget-conscious crowd, some of the recent "Intro Deck" products are pretty good. I'm particularly a fan of the "Life for Death" deck from New Phyrexia, just because it makes such excellent use of novel mechanics. Ertai's Lament has reviews of numerous preconstructed decks, and can probably help you find a better-than-average one that fits your style. There are a variety of fancier preconstructed products that can make a big splash in casual play, too -- in particular, the recent "Graveborn" "Premium deck", which is all about old-school reanimator shenanigans.
If you're looking for a reasonable deck to take to a tournament environment like Friday Night Magic, "Event Decks" are a good start. "Illusionary Might" is a good pick if you're willing to spend $30-50 to upgrade it into a proper blue aggro list; "Hold the Line" is probably the strongest event deck straight-up out of the box.
If you're looking to do more serious tournament play, I think you'll want to assemble a deck from an online decklist rather than a precon. The strongest wallet-friendly decks will tend to be aggro decks. Deck lists to look for are "Red Deck Wins", "Tempered Steel", "Mono-Black Infect", and "Illusions" or "Delver" decks. The "Building on a Budget" column on Wizards.com also tend to have good suggestions for off-beat "rogue decks", though those don't really have proven track records.