First of all thanks for the reply!

I apreciate your help! Now i need to know if the wattage of the head make a difference? For instance, I want to buy the blackstar ht club 50 watt head (50watts all-tube head) and my combo amp is 150 watts ! Is there any problem with that difference of the wattage??? The head has 100watt less than the spider! I think there is a difference between the wattage of an all-tube amp and a modeling amp, but i want to be sure so i don't do anything stupid!!!  Thanks in advance !!! (exuse me for any grammar/vogabulary mistakes)