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Many people like wide angle eypieces on dobs so you don't have to move them so much BUT the problem with them is that they cost more. A standard plossl has an apparent field of view of about 52 degrees and I used them on my dob before getting the equatorial platform with great success. The wide angle, low power eyepiece is great for observing extended deep space objects and making the jump from the Telrad to the scope as you can guarantee the object will be in the field of view of the low power eyepiece to allow finer centring for higher power viewing.
If you stick to the plossl design you get a lot of eyepiece for your money but you have to adjust your scope more often. Its a trade off but if you are on a budget then this is a way to go until you get all the other bit 'n pieces. Then you can go for a few really good wide angle eyepieces if you need to.
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