Throw in another recommendation for the idea of considering the 18-250 as a good all-round lens and starter lens. It's got tremendously useful range and can be surprisingly sharp and detailed across the range. The 50mm is also a good pickup, though it might truly be worth a quick look at some used lens places like keh.com to see if you might pick up a cheap Minolta 50mm F1.7 - it's also an excellent lens, and you can find them under $100...that will let you put the savings into another lens (like the 18-250).
Once you start saving up for future lenses, you can buy specific lenses that are faster and tuned to specific needs - a wider prime, a midrange portrait prime, a high-end fast zoom, etc.
I bought my A300 and the 18-250 at the same time, and never used the kit lens...the 18-250 was my main walkaround and all purpose default lens. When I went to the A550, same story - I bought it body-only, and use the 18-250 as the default lens. I also have the Minolta 50mm F1.7 bought used, and then built up other lenses for specific needs to fill in the gaps - low light, wide angle, portrait, telephoto for wildlife, etc. The 18-250 can do everything well for all my other shooting.
(In my gallery, I keep a subgallery of all my photos divided by body and lens, in case anyone wants to see a specific lens' performance...feel free to take a look at A550 shots, 18-250 shots, 50mm F1.7 shots, and any other lenses I use: http://www.pbase.com/zackiedawg/cameragear
Best of luck!
Sony DSLR-A68 / Sony 18-250mm / Minolta 50mm F1.7 / Tamron 150-600mm / Minolta 300mm F4 APO
Sony A6300 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / FE70-200mm F4 G OSS / FE70-300mm F4.5-5.6 G OSS / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses