Don't let comments like Twinkle's get to ya, Havoc. If you look at other "I'm a beginner, what should I get?" threads you'll see the same sort of thing.
You can probably pick up a Bounty Hunter Tracker IV on sale brand new for less than $100. It's been the staple beginner machine for well over a decade. Simple and easy to use, with a good "2-filter continuous-time" discriminator. Plenty of posts about it in the BH forum.
A few years ago I was doing some work for White's and they sent me a Spectrum XLT to familiarize myself with. I played around with it for a couple hours and reported back to White's "may God have mercy on my soul if I ever inflict a thing like this on a customer!" And I haven't.
Some people do like the XLT. But neither its price tag nor its user interface put it in "beginner machine" territory.
The best beginner machines are in the $200-350 category, from several manufacturers including the trademarks I represent (BH, Fisher, Tek), but if you ain't got that kind of money and can afford a TK4, I'd say get the TK4 and start having fun.
--Dave J.