Hey Obioma, hope you are still with us.........we get excited talking about gear choices and may inadvertantly not address your level of understanding. Most of us learned about all the gear issues from websites/forums/fotographer buddies; and simply experimenting with different lenses over a period of time.
The "CV" lenses are Cosina-Voigtlander, made in Japan, very good quality for much less the price of new Leica or Zeiss lenses. (To keep it simple. these 3 brands are probably the top 3 used by folks who use this website. There are other choices, more exotic, etc, but these are the top 3 used). I learned alot about lenses from Stephen Gandy's site
www.Cameraquest.com where he sells the CV lenses (I believe he is also a stakeholder in this website, which is why you will see advertising for Cameraquest here). He also has tons of info on rangefinder lenses in general; older Leica lenses, e.g. Check the Zeiss and Leica websites for info too.
I've felt that a good fast lens can be f1.5 or f2.0 or even f2.8, so you have a lot of choices with new CV lenses, new Zeiss lenses, or used Leica lenses (the most expensive of the bunch).
The RD-1 does not function like a regular film camera in terms of the lenses. A 35mm lens on a film camera will turn into the focal length of a 52mm on the RD-1 b/c of the "crop factor", having to do with using a digital sensor to record the shot as opposed to film. Different digital cameras can have different "crop factors", so the lenses bought for a digital camera need to be tailored for that camera and the lenses you normally use on film cameras.
Your choice of 2 fast lenses is great, and the RD-1 is a great camera, I have an RD-1s (so dont go buy a Leica b/c someone told you to!!). So, for example, IF you liked to shoot with a 35mm lens on a film camera, and the "crop factor" is 1.5 dor the RD-1, you can look at getting a 21mm lens which will give you a 33mm lens on the RD-1 (1.5 X 21mm = 33mm) .......OR ........you could get a 25mm lens which would turn into a 37mm on the RD-1 (1.5 x 25mm = 37mm).
Again, you have a lot of choices, and will probably need to just buy a combo that feels right to you, shoot pictures with it for a some months, look at the results, and either keep the lenses or sell them and try another. The good news is that, with $2000, and many choices, you cant go wrong!