saving up for my Dslr

bad times are coming, everyone's curbing spending yet i'm thinking about my dslr. i've started putting aside some $$ for my dslr which i would plan to get by end of next yr. even if i finally dun get the dslr, at least it's some form of forced savings.

wondering if my budget of $4k is enough...

(prices are estimates based on current market rate)
Nikon D90 with kit lens - $1690
Sigma 10-20mm - $750
SB900 - $650
Crumpler 5 million dollar home - $175
Slik 340DX tripod - $150
Misc (SDHC cards, spare batt for cam, spare batt for flash) - $250