I suggest you temper your anger with a bit of a reality check.
People are trying to save you from yourself, not make a fool of you.
You said you were on v8.x - not us. We always try and remind people that v8 goes EOL on 31 March 2017 because the RHEL/CentOS 5 base does. https://access.redhat.com/support/policy/updates/errata/
If you want to continue running a unsupported, and in time, potentially insecure OS then that is your prerogative, but don't expect help when you have an issue. It's not FUD, but fact. Yes v8 will run until the end of the universe. So will DOS, Windows 3.x, 95, 98, 2000, XP..... But is it secure ? If it is connected to the outside world with your company data on it, is that a wise idea? What happens if your hardware blows and you can't get a suitable replacement hardware to run it?
v9 was released 06/2014 some 4 years after RHEL/CentOS 6. That can hardly be called rushing. We are not 'dedicated followers of fashion' - that's the first time I have ever heard Koozali SME called that - most complain that we are too far behind the times. It has a 10 year support plan and goes EOL in 2020. Not our choice but RHEL. Also not our choice to have backup/restore instead of in place upgrade. Again, that is an upstream decision.
The benefit of v9 over v8 is that it is supported with updates. Simples.
By all means wait for v10, but be aware there is absolutely no timescale for release. Obviously it will happen faster if people like yourself got involved in testing etc...... but don't just sit there and wait for everyone else to do something. We are all volunteers, and all have day jobs.
Hardware. You mentioned the hardware you were running, not us. I merely passed comment. You live in exactly the same country that I used to from the looks of things, and where our company is still based.
You don't even need 'relatively new' if you are trying to replace a Celeron 733Mhz with 512mb RAM. Exactly how old is that ?
I have 2 x 32U racks, one in my UK office and one where I live abroad, both full of 2nd hand kit. The only things I have bought new are a PoE switch and a few routers. I have built this up slowly from a couple of simple desktop PCs come servers that I started with. All the rest I have bought off ebay or recyclers. It has cost 2/5ths of nothing in reality.
You can buy a DL380 G5 for around £100 on ebay. Fill it with some drives and you are away. You don't have to do that overnight, but start somewhere. ML310 G3/G4/G5 ? I have a ML350G2 someone GAVE me that I use as a backup box with a 6 drive RAID array - I bought a pile of 2/h 320GB SCSI drives for pennies so I have a hot spare, plus several cold ones on the shelf. I could easily use it as our main server...... But the point is it cost me less than buying a new desktop machine. Battery backed cache for a RAID card ? I bought new batteries off Farnell for about £1.50 each, split the case and soldered them in. A damn sight cheaper than buying a new battery pack and works perfectly. There is stuff out there. You might just have to hunt a bit to get a good deal. Ultimately your business depends on this stuff. It might cost time and money to upgrade stuff, but it's a long term benefit to the business.
No, this is not about your immediate issues, but from the things that you mentioned we realise that you are potentially going to have some in the near future.
So, in essence we are commenting on things that you have said and have tried to give you the benefit of our knowledge and experience, not take you to pieces or make a fool of you. Please take it in the spirit it was offered.