Hello,
I currently have hhkb pro2 and RF 55g and had a RF variable weighted and have tried the TypeHeaven.
My recommendation for you is to get the RF 55g only.
The Realforce 55g has the most Topre rubber cup-oneness feeling, by far...
By going straight to the RF 55g you basically satisfied your 2 requirements, Quality Feeling and Value for money since you don't have to waste money on other Topre boards (speaking from my own expansive experience) and/or even keycaps (Novatouch...)
I know there is the unique feelings differences of say a hhkb and a fc660c (dye-sub 2014vers) but the price you pay versus the feeling you get is REALLY an expansive trade off.