I am planning to buy Raspberry pi 2 Model B. Predominantly for two purposes,

i) Download Box (for Torrents, ftp / http downloads)

ii) Web Server (For replying some requests to Local Client computers ) and sometimes it will be used as an intermediate to share files between devices inside Lan.

Please note that it will be 24/7 powered on most of the time and connected directly to the router via ethernet cable.

My budget is maximum $40-45. Will raspberry pi perfectly work for this purpose? or any other board would you suggest? If you have used it, what average practical internet download speed do you get?