The Mets’ front office is really cooking with gas now! Hot off the heels of the Casey Fossum pickup, the team has now added Cory Sullivan to their outfield, signing the 29-year-old to a $600,000 contract that includes another $300,000 in incentives.

Obviously I can’t contain my excitement … especially when this signing comes so close after the Fossum deal. The Bisons are starting to look like a real AAA team — one that might actually provide competent support during the year in the event of injuries to players on the big club’s 25-man roster.

It does seem strange, though, that the Mets would scoop up another light-hitting, good fielding, centerfielder who hits from the left side. Endy Chavez was surplus last year, and the Mets already have Angel Pagan and Jeremy Reed signed to guaranteed MLB contracts, not to mention Marlon Anderson. Oh, and there’s Jason Cooper and Rule 5 (minor league phase) pick Carl Loadenthal, and the imminent arrival of Fernando Martinez. Considering that neither Carlos Beltran nor Ryan Church will ever be taken out of games for defensive purposes, all these Endy types are overkill, no? You can only put in one player at a time to play left field, after all.

FYI, Sullivan’s career: 355 games, 927 ABs, 8 HR, 78 RBI, 25 SB, .279 AVG., .330 OBP, .391 SLG. He does have the reputation of being a very good fielder, though the sabermetrics don’t necessarily support it.

The only way this signing makes sense is if it is a small part of something bigger brewing. For example, maybe the Mets are about to ship Ryan Church and Daniel Murphy to Colorado for Aaron Cook or Jeff Francis, and will then sign Adam Dunn and Manny Ramirez to play the corners — both of whom WOULD require late-inning defensive replacements. Pipe dream, I know, but dreams are about all we Mets have left at this point in the Hot Stove season.

Just in case Alex Cora breaks his leg, the Mets have signed Argenis Reyes as a backup plan. Reyes is expected to begin the season in AAA Buffalo.

Reyes flashed a decent glove, a lot of hustle, and not much else in his 49 games with the Mets in 2008. His most valuable asset — according to the SNY broadcast team — was his being “always in the middle of something.” High praise for a guy who hit .218 with a .259 OBP and .245 SLG (who knew it was mathematically possible to have a slugging percentage lower than your OBP?).

In addition, the team brought back another former Met, LHP Tom Martin. Martin would have been a great addition six years ago, when he had a career year with the Dodgers and had a 3.53 ERA in 80 appearances. He pitched in Flushing in 2001 and posted an eye-popping 10.06 ERA in 14 games. Hopefully he can improve upon that in his next go-around with the club.

Interestingly, Martin — who turns 38 in May — was released by LA during spring training last year and pitched five innings for the Long Island Ducks, striking out six. From my point of view, it’s a so-so signing — more paint on the wall.

Hopefully the signing of Martin will not block the return of Ricardo Rincon, who did an admirable job in 8 appearances last September.