Hey guys, some advice would be greatly appreciated. I'm currently running an old RB (nova-based) 3-port in my buggy. It's been very reliable but I'm looking to upgrade to something with more power. The prices on the new Nova-based engines are very good compared to a few years ago but I'm a little overwhelmed with the options. I'm looking at the 7-port engines and it's hard to discern their differences by the spec sheets.

Top Elite 8 Off --- (BS: 16,26x16,80 mm; MP: 36.800 RPM)
Rex Paloma Limited, gold head --- (BS: 15,88x17,60 mm; MP: 35.800 RPM)
Rex Paloma, blue head --- (BS: 15,88x17,60 mm; MP: 35.800 RPM)
Rex Legend 7 Off --- (BS: 15,88x17,60 mm; MP: 36.800 RPM)
Nova Vir-tus 21 Off --- (BS: 15,88x17,60 mm; MP: 37.200 RPM)
Nova Mito 7 Off --- (BS: 15,88x17,60 mm; MP: 37.500 RPM)
Nova Bonito --- (BS: 15,88x17,60 mm; MP: 36.300 RPM)

Is there anything I should know about these engines, or do I just choose the cheapest, or pick from a hat? Any of them have known issues or differences in powerband, reliability, etc.?