I'd check your local rates, but it sounds low in my area, especially for a reception -- and even for a solo performer. The prices you quoted sound like bar gig rates, not wedding rates.
Is this the ceremony or the reception? These are usually considered separate prices. Your first price would often cover the hourly rate after the flat fee of the first two hours for a reception (flat fee plus $100 [or whatever] per hour after the initial two hours). You could maybe charge that rate ($100-150) for the ceremony alone.
If you do the ceremony, you'll need to check if there are any liturgical pieces you need to be aware of ... for example, a Catholic wedding is a Mass, and there are Mass parts you need to play. Other than that, there may be certain pieces you have to play (for general seating, for seating of parents, groom's entrance, bride's entrance, recessional). There could other things: I had one ceremony where I had to play music for the lighting of a unity candle. Be careful about music ... while it may be cool to learn a song (or maybe, maybe two) for them, you need to present your setlist to show them what you have available.
If you do the reception, be sure that they are aware that you are solo (if you plan on doing it solo, that is) and that what you do will work best as cocktail/dinner entertainment ... playing the Hokey Pokey and the Chicken Dance or other general dance music won't work as well solo.
If the gig is for both the ceremony and the reception, just charge your reception base fee.