So basically, and other then looking for support out of the writers others see as likely making the default value guess that's needed in the process of printing their stories, none of us really know what the Sox are or are not willing to spend atm.
It's not that my math is bad either btw, it's just that in context to adding the $25m salary player atm, that would currently put us at roughly $160m in total real money player salaries committed towards the 2013 season. That's a lot of money, and after seeing the "we can't afford to offer more then X amount" buckling that went on around some of the 1 year deal opportunities that were out there last winter, i'm not entirely comfortable projecting last year's $170m+ player payroll as something that's truly in this ownership's ideal comfort zone. Much less a level of spending they are now willingly going to replicate a few months after scoring the lucky bail out the Punto trade graciously provided them.
Personally, i'm left speculating that the need to view things in LT dollars is going to become a thing of the past, the new "ceiling" in play will be notably under the current $178m threshold, and that everything we do going forward from here will be about the real dollars going in/out on an annual basis. Time will tell i guess.
The Red Sox have ~$110-120M committed to 2013, so that gives them a lot more than $25M before they hit the luxury tax. Also, the luxury tax implications became particularly onerous with the new CBA, so the fact that the team was limiting expenditures last season shouldn't have been so surprising. We don't know what the new ceiling really is, but the team almost certainly has more wiggle room than the $25M you suggest.
Whether and how the team uses those $$$ is a big question. Betting all that money on a guy with bad knees and known addiction issues, or a decent (but not great) pitcher who didn't really want to be here anyway, doesn't seem all that prudent.