Zennith said:Mostly landscape . I don't think will be capturing fast moving objects
550D paired with a Ef-s 10-22 or a tokina 11-16 f2.8 will do the job. But if budget is main concern can consider older models of Dslr maybe 500D with 10-22. Don't really need the f2.8 from the tokina if mostly landscape.
But do provide some allowance. You might start trying event and people and sooner or later want a "faster" lens.