the Aqua Lung Calypso with the provided 1st stage or the ScubaPro R195 with the MK2 EVO.
From personal experience in dive school with the two regulators, the SP has far less issues with much better performance and more reliability than the AL Calypso. I'd recommend however spending few dollars more and buy the MK11/C370 with superior performance. The MK11/C370 isn't much more than the the MK2/R195. If you still can't afford the MK11/C370, skip few meals and you will have enough saved to afford it.
https://scubapro.johnsonoutdoors.com/regulators/systems/mk11c370-dive-regulator-system-int