Depending on what you have, another model Decware may be a better choice.
This statement that I made was brought to my attention, but was removed while I went and had lunch, but I will answer it anyway.
From what I am able to see by comparing the Rachel to the Artist, they are very similar even though developed independently of one another.
When I worked with Syd Beaumont of Ideal Innovations in developing the Artist, I wanted the Decware sound (based on my experience with the SE84 and the Zen Head) because I love it, and the first Artist out of the gate nailed it - hence I believe I have gotten as close to a Rachel as possible being they both use octal based output tubes wired in triode mode. That said, just start tube rolling either and you have a totally different amp.
My greatest experience with Omega speakers is listening to them through 3 generations of SE84. The SE84 will light up any current Omega I have heard hooked up to it, so I can wholeheartedly recommend the SE84 (unless you're into party volumes). If, however Brainportugal has older hempcone or fostex Super 5/3XRS, I would lean toward the Rachel for more power. Current Omega? save your money and buy the Super Zen at 900 bucks.