Iwaki is good. Ampmaster is good too. Iwaki can really handle some pressure, but can also be 300+ watts. Ampmaster should be about the same as a Sequence equivalent with better head. Both are very reliable - as in 8-10 year reliable, not 1 or 2.
Gen-X are Iwaki substitutes and are also very good.
I have a Diablo DC, but no idea about the longevity - head and flow are as-advertised. If I get 5+ years out of it, then I will be happy. Low wattage, a durability risk since they are unknown.