Queen Arabesque plecs are here in NZ but the ones I have seen, from memory, have finer lines than the one pictured. With the way you have your tank set up they are less likely to be able to hide as much. It is really hard to judge how much a plec will hide - if your house is quieter and no one 'pops up' in front of the tank they are less likely to be spooked. On average we see the ones in the shops where they are subjected often to noise, people all around and children tapping on the glass. No wonder they hide - I would too!
Definitely the big band tiger plecs are more visible in the tank, they are not as shy but there are also other beautiful plecs around in the shops.
One thing to remember, what you have as bottom dwellers is also dependent on what middle top layer fish you have.
Oh and $250 is a good price for a CO2 bottle that size, mine cost me $500 and then I still had to get a solenoid as the regulator that came with it didn't have one as part of it. The bottles are already inspected and unlike some you buy, you are not going to have to mess around finding a regulator that fits.