I would keep it simple.
I love using my rollers, kreitler are definitely the best but expensive and there are all sorts of other fancy roller add ons that you can have so that you can get out of the saddle and honk and the price reflects this.
Having tried them however I personally don't believe these are worth the extra money. Tacx antares are a good first time buy especially if you are new to rollers and if you use with a fixed gear then all different manner of training can be achieved
Using the russian steps (interval training) on the rollers with fixed wheel is a fantastic way of improving strength endurance and sprinting ability.
The main advantage I found of e-motion et al was only that the numbness in the fingers hands and saddle areas could be shaken out but you get used to this in time anyway. The simple rollers improved my riding line, pedalling efficiency and style and let me spin a much lower a gear on the road even when riding in groups.
People often compare them to turbo trainers pointing out that resistance cant be changed but using a gearing such a 53/12 will give a good resistance believe me! Colleagues of mine use geared bikes and change resistance through changing gears up or down.
ime not fat ime a sprinter