The Ovation is a lot of money for what you are getting and not as much of a leap over the Rega as you might think. You can get a Sota Sapphire and put a Kuzma 4 point 9 or a Schroder CB on it for not much more. You will have an isolated turntable and a much better arm. You can also get a really nice dust cover with the Sota.
The Boulder is a fine phono stage I prefer the Channel D Lino C 3.0 which you can tailor to suit your needs but if you get heavy handed with the options the price can get up to $7000. It is a transimpedance phono stage like the BMC, Sutherland Loco and CH Precision. This allows you to get a lot of gain out of very low impedance MC cartridges and yet maintain an excellent signal to noise ratio. You also do not have to worry about loading the cartridge. You can add a voltage mode input and /or a moving magnet input if you want. Check out the reviews on the Lino C.