The best type of paintball for the 98 series is a mid grade paint (anything around 60 dollars like Diablo All Star). As for any gun, you don't want to just buy the cheapest paint possible (monster balls) because of the poor consistency and tendency to bounce after impact, but too high quality paint (easily breakable) in a Tippmann will chop a lot of paint.
Tippmann
Tippmann 98 custom, only 100-150 bucks. What makes it the best is the flatline barrel you can buy, so much pwnage
There are 3rd party builders who will do such a thing. But your best bet would be to take it to a local paintball shop.
Your best bet would be to find a specific paintball shop or field. Canada is known for its field and shop called "The Badlands". They should have everything you need.
Canadian Tire has the best deal on paintball gun packages. One can also get best deal from paintball online store. Amazon has Tippmann 98 package for $154.
Paintball grenades are a great outdoor sports option. The most highly regarded paintball grenade brand would be Empire. Another good brand is Tippmann.
They are actually one in the same. There was never an orginial "model 98" only the custom series. The difference though would be found in the Tippmann 98 custom Platinum series with its easy to remove body. There is also a difference in barrel sizes if im not mistaken but I think the newer 98 customs and platinums have the improved size (the same size as the A5)
98 custom is the best option. While both of them are cheap starter markers, almost all Jt products have a reputation for using cheap breakable parts, where Tippmann has an almost legendary reputation for durability (that is why the 98 is a standard rental model)
Any of the Tippmann/BT4 guns have the most aftermarket parts. not only barrels, internals and electronics, but outer grips, shrouds and other aesthetic parts.
There are many different types out there; folding air though, fixed, telescoping to name a few. Take a look around and find what works the best for you.
Tippmann is the best brand too get. Spyder is another good brand that isn't as good of a gun but Tippmann's are a bit more expensive but there is really no difficulty with Tippmanns at all. Invert mini is the most expensive gun around these days ( 500$ ) or the Bob Long guns.
Tippmann is a brand, not a gun. In general Tippmann's are viewed as the most reliable and durable guns on the market. This is because they use very simple, hard to break, low maintenance parts, which is why they are used by most places as rental guns (usually the Tippmann 98). However this durability comes with many prices. They generally shoot slower, less accurately, and less consistently then guns of a comparable price (without upgrades). In short, almost every Tippmann product will work for longer then a comparative product, but not as well. Tippmann also has some of the best Military simulation kits available for its markers.