I'll second here what Mikes said. Specs aren't everything; some things (e.g. cooling) are never on the spec sheet, but vital nonetheless. The best-spec-for-money machines usually offer crap on those. Case in point, my brother's HP Envy; great specs, but crammed in a small case with an undersized fan. He uses an elevated stand for better airflow, cleans it out every few weeks, and is still stuck in perpetual power-saving mode to avoid overheating.
Reviews often make the same mistake: they use it for a week without obvious issues, like the specs a lot, and give the machine a great rating. What does that say about the wear and tear the machine will go through? Try looking for long-term user experiences instead; harder to find, but much more reliable. Also keep in mind that business-grade machines have a generally better build quality than consumer machines: companies have actual professionals picking their hardware, as opposed to Joe Bloke who doesn't look beyond the spec sheet.