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I'd 2nd Alexander's comment re the coma corrector. Its not something you need to rush into at all for visual. You're better off putting the money into better eyepieces, but even then standard eyepieces are a great place to start these days. For a Baader MPCC for example you have to use special spacers on the end of each specific eyepiece.
I'm biased, but bang for buck its very hard to go pass a Newt, and my 8" has given me lots of flexible enjoyment (ease of transport, setup, visual/imaging).
For collimation, I'd make sure you buy a cheshire first, before playing with lasers. Cheaper too. You'll find lots of threads here where people have got into all sorts of trouble with a laser - their chief advantage is ease of use day/night for a quick tweak. There are some common collimating situations a cheshire shows up well but the laser can't or won't easily show.
Would be worth posting in the wanted area for a 2nd hand newt too I'd suggest once you know what you want. People often move on to more expensive gear later on, so its not unusual to be able to pick up an OTA for $300-400 2nd hand in great condition.
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