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You will find the 2" will have an adapter so you can plonk your existing eyepieces right in. Generally, my observations are that 2" tend to be of longer focal lengths and so less magnification. while you can find 2" of 20mm or longer, you won't generally be able to get anything much shorter. One of the problems you may find with the 2" is that they are much heavier which may cause some balance problems, my 2" XW-30 is a pretty big beast compared to its smaller bretheren of the 1 1/4 variety. The 2" will also be more expensive than a comparable 1 1/4 equivalent.
They say "once you have had 2" you won't look back" but you bank account may say otherwise. They may give a brighter image if the 1 1/4 does not let all of the light cone through, so that may be one difference. Hopefully someone who knows more about optics can answer this.
Essentially, just drop them in the adapter and away you go.
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