Sounds like a great kit. Personally, I'd use the TLR over the RB any day, especially out of the studio. The C330, while not as compact as a fixed-lens TLR, carries pretty nicely.
I'd think 450 euro is a bit much to ask for it, but if it's all in truly mint condition, maybe it's worth it. I'd scope out prices on Ebay or even a kit shipped from KEH in the US and see how they compare. And consider the value of 1) being able to inspect the gear your local guy is selling before you buy it and 2) getting everything you'll need in one spot.