Like Wrinx, I'm suspicious of silicone based fluid. It has a higher degree of compressability, so it tends to make the brakes feel spongey.
Dot 5.1 will help, but the dry boiling point is typically less than 15 degrees higher than DOT4 fluid. DOT5.1 does have a higher wet boiling point (fluid absorbs water through time), and so will maintain its resistance to boil longer than DOT4. I change my brake and clutch fluid at least every year, so this is not an issue for me.
The braided hoses are good, but only if you feel the pedal is spongey. They help reduce the pedal travel between check, and heavy braking. The do not, however, reduce the actual travel of the pedal until the brakes are on.
Grooved discs are good as they help stop the gasses building up between the rotors and pads when brakes are hot. This is a cause of lengthend pedal travel. Crossdrilled discs do crack, but blind drilled (not drilled all the way through) give the best of both worlds (fade resistance and longevity). (eg Red Dot)
Do your brakes really get hot enough to warrant the drilled/ grooved discs? One other point is that these performance discs tend to have a softer disc material. This will give better pad bite, but they will wear faster and will tend to gain grooves as they wear. A really, really cheap disc will give nearly similar performance!
Lastly, look at friction coefficient of the pads. A pad with high friction should be fitted all round, otherwise the brake load valve should be adjusted to compensate. I fitted the (unpopular on Alfaowner) EBC Greenstuff to the front of my 155, and adjusted the valve. The result is really short stopping distances, good feel and the pads are less speed sensitive. A track day put hardly any wear in the pads and they still work very well from cold. The final benefit is that the brake dust is so reduced that the rear brakes now produce significatly more dust on the wheels than the front!
I'm very pleased with the results, and although I have not tried other performance brands on the 155, I rate them highly.