since you humbly mentioned your skill level at 0.5-1 / 10 maybe you should really got for 2nd hand DSLR like 350D for canon which you mentioned you are more inclined toward. Since you said that you like nature / animal. I guess macro is one of the shots you enjoy taking. Then maybe beside your 18-55mm Kit lens, you can get the Sigma 70-300mm macro (Like what I have) then get a decent tripod extra batt, memory card, dry cabinet, camera bag... a flash gun, upgrade your pc to bigger hdd disk space...
2nd hand 350D (kit) + Sigma 70-300mm + Tripod + extra batt + CF + dry cabinet + bag + flash + HDD
$900 + $400 + $150 + $90 + $150 + $150 + $100 + $400 + $100 (All price here est)
Total around $2440 (est)
Unless you are really ready... it is really a long investment... the above is what I have... but still really basic stuff... then you will suffer the BBB virus....like myself.. aiming for new stuff again... like prime lens... L lens.... better tripod, a monopod... bigger cabinet... another smaller bag, bigger memory card and more and more HDD space