please don't consider me arrogate but I don't quite understand the problem. First you buy a premium camera with 36 megapixel sensor and then you worry about squeezing the images small enough so that they are easier to send to the clients (via email, FTP or by other means).
To me the solution is obvious and simple. The net is full of web hotels for less than $100 a month. I manage three already, each with 5 GB of space. A 25 GB site costs about 70 € ($100) annually in Finland.
Why not to upload the images to a subfolder in your own site and let the client do the dowloading at his/her own pace. If necessary, you can restrict the access easily via username and password. You don't need to provide any flashy web pages or even FTP instructions in order to distribute images this way. Just let the client know the correct URL to the folder; a web browser shows the list of files promptly. Anyway, it is just a snap in Lightroom and many other post processing tools to generate slide shows for easier viewing, if or when you feel like it.
The only issue I know in the above way of doing things is the upload speed; it could be just 1 Mbps which means it could take awhile to upload large files. Managing the web/FTP site is very simple and should not be a problem.