I think the T1i is an excellent first DSLR. Though it can be quite complex if you want to use it in a mode where you choose all the possible options for metering, focusing etc. it also has a large set of essentially fullt automatic modes, so if you're ever confused about setting you can always wswitch the the "green sqare" mode where it's literally "point and shoot" or select "macro" or "portrait" or "landscape" modes and the camera will optimize settings.
The 18-55 is OK for closeups and 55-250 is OK for wildlife. Though the 18-55 isn't a macro lens it will go to a magnification of about 1/3 lifesize at 55mm, which isn't at all bad.
Just be careful where you buy from and avoid the Brooklyn "bait and switch" stores (be sure to read
http://www.bobatkins.com/photography/photo_gear_buyer_beware.html. Watch out for shipping and handling charges, restocking fees in case of return and stores trying to sell you "extras" (which are often supplied with the camera as standard, such as batteries and chargers!).
$900 is a good price for the kit and includes the Canon "instant rebate" Right now that's the price from
Adorama ($899.99 - free shipping)Your step up from the T1i would be the EOS 50D. However the 50D doesn't have a video mode if that's important. The step up from both the T1i and the 50D is the EOS 7D, which is a very good camera indeed, though you're now looking at almost $1700 just for the body alone which will take you over $200 even with the basic 18-55 and 55-250 lenses - and you might really want better lenses to match the body.
The 50D is probably a better choice, though isn't available in a kit with either the 18-55 or 55-250 as far as I know. You can get the
50D body (new) for $940, plus a refrurbished
18-55IS for $110 and a refurbished
55-250 for $200, giving you a total of $1250 - add on about $120 if you want both lenses new. Refurbished lenses are usually indistinguishable from new.