Right after the Mac Mini line was updated, I decided to get the 2.5 GHz base model in consideration that it might satisfy all my needs. However, after a short period of time of leave, and especially after reading various reviews and experiences of other people, I am now undecided and would like to get some help from the guys and gals in this forum. First of all, the Mac Mini will be used at home and it must do the following things for me: 1. Stream audios and videos. 2. Do Word processing (mainly LaTeX, some MS Word). 3. Render graphics (mainly EPS, can be quite demanding for 3D graphics). 4. Perform some number crunching (numerical computations & simulations, only for the purpose of testing C++ computer codes; the real run will be done on my Mac Pro in the office). I would like to have the Time Machine to do one backup (I will have another back with a Time Capsule and a third backup using a USB HD; maybe a fourth backup on a USB stick). Thus, I'd like to have two 7200 rpm HDs inside the Mac Mini (I do not consider an SSD at the moment). I also need to have at least 4 GB memory. Option 1: 2.3 GHz base model. Install 4 GB memory and two 7200 rpm HDs by myself. Option 2: 2.5 GHz base model + dual i7. Install two 7200 rpm HDs by myself. Option 3: The server base model. Thanks in advance for your inputs and suggestions!