Rozzi - Canon and Nikon are the popular kids in school, means nothing except that they are more common. Sony makes excellent DSLRs, they inherited the Minolta line - of which I use for my own personal system. I've plenty of experience with all 3 major brands, and can honestly say that it makes no difference in your photography which one you pick, give them all equal footing to earn your favor, check out the niche differences and see which one is suited most to your specific use. Anyone who says 'X brand is the best' is a fool. There will be minor feature differences, slight differences in menu and interface, etc. Big picture, all are very equal.

Some similar Sony DSLR's worth a mention are the A3XX and A5XX (00/50). The 5 series stands head and shoulders above the 3 series in high ISO image grain due to newer process and CMOS vs CCD sensor. One unique feature they have that others dont is a specially designed live-view mode that interacts much quicker with autofocus. On the flipside, they lack a video mode which some of their competition has.

Also - offering assistance is something we here all enjoy doing. You are certainly not being annoying.