I personly think you gonna be fine even with a ps3 with newer firmware very soon, I think probably right before christmas so keep an eye on the ps3 scenes latest news. For Example
Here is some reading to do about an upcomming jailbreak for firmware 3.73 by KaKaRoTo.
I wouldn't be surprised if all this did was make it possible to create CFW based on 3.73, not enabling anyone to install CFW
onto it.
Actually, it was stated you can install it from 3.73, in other words, this is for people stuck on 3.73,
Then again, if you're on 3.55, someone reliable will just take his work, enable piracy features like backup managers and make a new firmware.
Once reliable working 3.73 CFW starts rolling out from reliable sources, there won't be any points to remain on 3.55.