Hi Michelle,
Like others above, I say definitely get the analog SPG regardless of whether you get a hoseless transmitter or not. You'll have to call the dive if your computer malfunctions or floods or dies as you shouldn't be guessing how much air you have. And unless you're loaded, good nitrox computers (such as Oceanic Veo250, Aeris Atmos 2) start at $250. It's probably only a matter of time that you get nitrox certified, so you might as well get a nitrox-capable computer now. I regret gettting my first air-only computer when many diving friends advised me to get a nitrox capable computer.
Dive safely.
Like others above, I say definitely get the analog SPG regardless of whether you get a hoseless transmitter or not. You'll have to call the dive if your computer malfunctions or floods or dies as you shouldn't be guessing how much air you have. And unless you're loaded, good nitrox computers (such as Oceanic Veo250, Aeris Atmos 2) start at $250. It's probably only a matter of time that you get nitrox certified, so you might as well get a nitrox-capable computer now. I regret gettting my first air-only computer when many diving friends advised me to get a nitrox capable computer.
Dive safely.