i need a computer with high speed processer

I think one wit i5 processor would be reasonable choice, i have i3 and i can play all the latest games and so on and i5 is a bit better so you won't need to buy new one for a long time. Also a good graphic card and you can get it all for around 400-500€ but if you don't have that kind of money go for i3.

If you do not have enough budget, it is not necessary for you to use intel i7,i5 or i3, you can use AMD processor instead. The price is much cheaper than intel, but the quality is not worse. I am using it now and I am quite satisfied with the speed of my computer. It is totally ok for imaging processing as well.

Try i core 7 or other similar computer

if you buy computer online all will be seconds. rather buy it in a store,rather collect informations about the latest processors high hard disk capacity, high capacity of ram,with graphics card,rather buy all parts from a singe company. if you buy assembly set, that is all one part from one company and other from another company, it would not be as good as before.so keep in mind of all latest upgrades and then go for buying it.