Stats and skills for any race (endurance, intelligence, destruction, illusion etc) will always end at 100. This is the same for any race, and is your gaol and cap. In other words, by end game all characters will have identical skills and all, regardless of race. The only things that alter gameplay for races are the racial powers, the ones to keep an eye on are ones that give bonuses to magicka (bretons, high elves), and ones that give weaknesses (high elf, they have a few). So, a high elf and breton may have 100 intelligence (end game), the high elf will have more magicka, but the breton will not suffer the penalteis the high elf does. Birth signs can also boost magicka, but are you willing to trade the bonus magicka with penalties for maximum magikca, or will you settle for a lesser magikca and no penalties. Certain race/birth sign combos will always have more magicka, thus be able to cast better spells that require more magicka. Any and all races though, by end game will have mastered all aspects from weilding a sword to casting a spell. The difference is how you choose to get there, the race/character is just a means of getting there. So, all things being equal (mostly), just choose a race your happy with.