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You're not going to see much colour at all, in any scope except for maybe a dull grey-green, in any nebula. Your eyes just aren't sensitive enough to detect colours at such low light levels. However, people have seen some colour using rather large scopes...16" and larger. About the only thing you'll see good colour in is bright stars and the planets. One thing you will notice though, is that your UHC filter will help enormously by cutting out pretty much all the offensive wavelengths of light from the surrounds, namely streetlights and skyglow. That will allow you to see things you wouldn't normally see such as dimmer objects and details in nebula from an urban site. The Baader filter is a good one to choose. You also have Astronomik, Orion, Bintel, GSO, Astrodon and a raft of other companies that make LP filters.
Choice really depends on what you can afford and the quality you'll get for the price, but don't be put off by relatively cheaper filters. Many are of good quality and will serve you well. There are some exceptions. You'll pick up on what's best from listening to everyone here and asking for advice (also, when you can, join your local astronomical society...they're a wealth of info).
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