Gas and Oil Home Heating Furnaces - sealed combustion system

I've pretty much decided to replace my old (1950s) oil furnace with a new one. The old one vents through a 100 yr old brick chimney and is pretty funky. I don't think it would meet todays codes because of clearances around the metal pipe leading to the chimney and it would be a major pain to change it. I could vent through an outside wall very easily though. I am wondering what the best approach to this would be. I was looking at a system on www.fieldcontrols.com called the "SWG SEALED COMBUSTION SYSTEM" which also draws the combustion air from the outside. Is a system like this worthwhile? What would it cost? What are my alternatives for venting through an outside wall? Thanks for any input.

if the new system is 90 plus % efficient, there is no need for one of these. if it is needed, they run @450 to 550 installed.

First of all, I don't think there is a code to make you line an oil appliance chimney. Gas, there is because of the amount of CO produced by those appliances and the danger associated with it. Your chimney, unless it is disintigrating, may be OK for another 20 years. Maybe you could have it looked at by a professional chimney cleaner. Not a salesman. I don't care for the Field controls package. The motor is outside which sounds good, but the hoods don't seem to last very long and they don't use stainless steel screws. 5 years from now, when you need a motor (which SWGs seem to) the screws are all rusted and very difficult to remove. The whole system is just not appealing to me. The Tjernlund sideshot is a better system but the intake air is not an integral part. Warm air furnaces tend to leave more stains outside than boilers do too. They are very cold when they start (relative to a boiler) and that makes a puff of smoke on startup. Eventually, you will have a stain on the house. The sideshot is better at throwing the flue products away from the house.