Question Thinking of getting my first set of tanks for sidemount. Advice needed.

[Wibble]

As the old saying goes "a bird in the hand is worth two in the bush". Grab those cheaper 10 litre cylinders and enjoy using them!

One day someone will want to sell you a nice "Euro cylinder" twinset at a good price

 

[drakcheslav]

That's the plan. 2x10 are more than enough for local diving.
If I ever move somewhere where I will need more gas for more frequent dives I'll hopefully get different tanks.