Here are some races that Wiggins could viably compete for and win:
Tour de San Luís (Argentina, January) - a few uphill finishes and challenging-but-not-too-challenging-it's-January-after-all climbs, and a TT of enough length to give a GC type rider the win.
Volta ao Algarve (Portugal, February) - the Alto da Malhão finish splits up the field quite considerably, but a Wiggins in half-decent form should be able to hold close enough to win it in the ITT. Biggest threat would be Machado, who can TT and climb and will be motivated since it's his biggest chance to race in his homeland all season.
Ruta Del Sol (Spain, February) - the ITT here is short, but as long as he can stay in reasonable contact on the first climb he should be okay - Mick Rogers won it this year after all!
Vuelta a Murcía (Spain, March) - the ITT here is long enough to be more or less completely decisive as it's otherwise rather a sprinters' race.
Critérium International (France, March) - the normal race parcours in Northern France would be fine for him - mark the moves on the hilly stage but nothing too strong, then the short ITT.
Driedaagse De Panne-Koksijde (Belgium, March) - the ITT is decisive as long as you're strong enough to cover the moves.
Circuit de la Sarthe (France, April) - the ITT here may be too short to be decisive, but it certainly puts a rider like Wiggins in a useful position. If he can mark moves and make a couple himself he has the tools to win this.
Vuelta a Castilla y León (Spain, April) - possibly a bit tough; the 15 or so TT km may not balance out a big mountaintop finish with the likes of Igor Antón going full bore. But if he approaches it in some climbing form, he could be a contender, even if he may not be able to go with the elite climbers when they fight out the MTF stage.
Tour de Romandie (Switzerland, April-May) - with a prologue AND an ITT in a six-day race, the opportunities do present themselves, if Team Sky can keep a decent level of control over the race (easier said than done).
Szlakiem Grodów Piastkowich (Poland, May) - though rated 2.1, I don't expect to see the likes of Team Sky at a race as small as this. But it does have some interesting short hills, and a mostly decisive 25km TT.
Tour of California (USA, May) - the characteristics seem to fit Wiggins - prologue and a long ITT, a moderate amount of climbing with just the one serious MTF. Positive: apart from the American teams, nobody else will be taking the GC seriously. Negative: Tony Martin is a better time triallist than Wiggins.
Bayern-Rundfahrt (Germany, May) - a fairly long ITT sandwiched between flat stages and an intermediate one. Ullrich won several consecutive editions because of this TT focus. Wiggins could do the same.
Route du Sud (France, June) - an uphill ITT being the main difference-maker. Wiggins can climb alright, and he can TT well. Too close to Le Tour for him to race, most likely, however.
Post Danmark Rundt (Denmark, July-August) - a mostly flat stage race with the wind (thus far Team Sky's nemesis) and a TT to break things up.
Tour du Limousin (France, August) - four days, including a 40km time trial? Sounds right up Wiggins' alley.
Tour du Poitou Charentes et de la Vienne (France, August) - a similarly themed race with a few hills, needing some policing, but with a TT being key.