Options I'd consider would be Light Monkey (which also has a Pitkin controller built in); I'd only consider the 20AH or greater. The Ammonite battery which is good quality. Might look around at the Polish manufacturers, but my LfM experience has put me off of them. Santi do a larger 18AH(?) pack. All of these options are well over €1k.
My wife is using the LM 30ah dual output can with built ini pitkin controller and a halcyon focus 2.0 on e/o. She used an UWLD can for a long time, but something drew her to the focus. I think she prefers and hiid-type beam. Unfortunately Bobby's system can't work with the focus, so we had to use the LM, which is excellent as well. She did have an issue where a control board died on the second dive since she had it. LM fixed it asap.
Bobby's system is very good. It's what I use. The only negative to his heating system is the external controller. I acutally like it alot, but it's not perfect for everyone. My wife is 5'2" and small statured. When diving ccr between bailout regs, 2 mavs on her chest, and often a stage, she just diidn't have the real estate for Bobby's extrenal controller. Unlike the LM options she's using, you can actually see the temp % you're atWith my latchless system you can mix or match having the heat controller and light together and/or separate. There are other advantages to my system as well, such as constant heat output regardless of battery voltage, and many other features. https://uwlightdude.com/g6-heat-controller/