Malicious, the advantage of having 2 ps3s is that you can data transfer patches to a 4.21 ofw ps3 and play online with modded lobbys, but right know there are ways to play online on a 3.55 ps3. There are spoofers for 3.55 ps3s and other stuff that bypasses the new updates

So I think you are good for now
I'd advise ebay or craigslist, I bought a 3.55 ps3 off ebay, I would give you the link, but it seems like he's not selling ps3s anymore :/
Just search ps3 3.55 or something like that. you can always call the seller

I don't know where you live so there might be some better websites then ebay/craigslist for you, like free shipping, no toll and stuff

There is also this service here which will downgrade a 4.21 ps3 or lower to 3.55 ofw which you can jailbreak.
Link:
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Note: I haven't tried that service, so you should be careful!
Hope I helped you out buddy!