Don’t buy a cheap bike, buy a nice bike used off craigslist.
But other than that, it’s all up to your preference. For riding on roads I prefer a steel frame with track geometry. I would recomend a Mercier Kilo TT for someone who is looking to get into track bikes but not looking to spend a bunch of money. Brand new they’re $400 but like I said, you can find them on craigslist for a great price and a lot of times they might have some cool upgrades.
I’m Gonna Find Another You-John Mayer