I have to agree with Jodi, Critter, Kay and Boo - I have Dweezil, my 'tiel in a California cage (best cage that I own IMO) that is roughly 42" tall (including legs on casters - not including the play gym on top) X 36" (pardon my approximations I am not in there with a measure)
My point being - 'tiels need much more than a budgie cage. They need enough room for toys, multi sized perches and enough room to fully extend their wings and flap without getting injured.
Kay's cage that she built, is just about the greatest 'tiel cage I've seen! They have room to actually fly in there- she built them the most amazing aviary!
Bigger is always better - the more room they have the more variety they can be exposed to in the form of perches, toys... you also need to be aware of the bars and spacing.
***Edited to add: Sorry, guys but these cages are way too bulky and expensive! LOL. I'm just wanting something like a budgie cage, only bigger. Probably doesn't exist, right? Hehe.***
Well, you really need to take the whole package into condiseration. Yes, my cages are big- bulky? I suppose that would be up for debate. What I think I hear you saying is that you want the bird but you don't want to (or can't afford to) follow through on a vital part of his care- housing.
No one is trying to beat you up over this - just point out - a Budgie cage "or something like it" is not the best choice for a cockatiel.
Yes, mine cost me upfront but I knew when I got the bird a good cage was going to be part of the cost. One of the benefits of the California cage is that it's such a breeze to clean. Nothing sticks!
It also has angled food guards that attach to each side and 2 extra trays - to put on top of the bird's cage area under the play gym making for easy clean-up when he's up there goofing around.
In any case - look around and make sure you choose wisely- we can't get a bird and then skimp on any part of the care involved.
Improper housing can make for a potentially dangerous situation for your fid in terms of safety, not enough "wing span" room, room to move with ease around the entire cage... etc.