Another thought: as was pointed out above, the LA for being a Half-Dragon would be restrictive in the eyes of some- not something you'd want to do unless you have a particular concept in mind.
If I may so suggest, if you're really interested in having a PC with a strong Draconic link, there are other ways to do it:
1) The most common way is the Dragon Disciple PrCl. Its in the SRD and the DMG. It will require at least 1 level in a spontaneous arcane caster- Bard, Beguiler, Duskblade, Sorcerer, Warmage and probably others.
2) The Dragon Descendant, a monk-specific dragon-themed PrCl, found in Dragon Magic
3) The Initiate of the Draconic Mysteries, a monk-like dragon-themed PrCl, found in Draconomicon.
4) The Draconic Fist Monk ACF, which allows you to do additional energy damage on your unarmed strike 1/level instead of gaining your 1st level bonus feat.
5) Take at least one level of Sorcerer and take the Draconic Heritage and Draconic Breath weapon feat...and such other Draconic Heritage feats as you see fit to add.
It should be noted that none of these options are mutually exclusive.