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Having purchased a 12" dob recently and gone through this I would suggest you read everything you can about eyepieces here on IIS before you go out and purchase something. Eyepieces in the 4mm range can be hard to use if you need significant eye relief. There are some very good wide field eyepieces in 30mm which make using the dob much easier particularly when locating things and then go to more powerful narrow field EPs to get more power.
Also look into putting an azimuth circle on your base and get an inclinometre so that you can find objects easily and not have to star hop every time. With a properly aligned scope with setting circle and inclinometre you will be able to go right to the object location and then using the wide angle EP close in on it and centre it before going to a higher magnification.
Read the Dob Mod postings here and there are a number of setting circle files available that you can simply print and laminate to attach to the base. Build yourself a leveling base, this is a good mod to ensure you can level the scope during alignment so your co-ordinates are correct.
BTW what scope are you buying?
For dew management there are things that can be added to the scope and right now (winter) dew is a problem most nights. Your scope may have a fan behind the mirror and this can help keep dew off the mirrors if you use it to control the temp. Also you can make a dew shield to fit over the end of the scope and this helps as well. Then there are mirror heaters if you need to go that far.
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